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A084249
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Triangle T(n,k) read by rows: permutations on 123...n with one abc pattern and no aj pattern with j<=k, n>2, k<n-1.
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3
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1, 6, 2, 27, 12, 3, 110, 55, 19, 4, 429, 229, 91, 27, 5, 1638, 912, 393, 136, 36, 6, 6188, 3549, 1614, 612, 191, 46, 7, 23256, 13636, 6447, 2601, 897, 257, 57, 8, 87210, 52020, 25332, 10695, 3951, 1260, 335, 69, 9, 326876, 197676, 98532
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OFFSET
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3,2
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COMMENTS
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See A228708 for further information.
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LINKS
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FORMULA
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T(n, k) = C(2n-k-1, n) - C(2n-k-1, n+3) + C(2n-2k-2, n-k-4) - C(2n-2k-2, n-k-1) + C(2n-2k-3, n-k-4) - C(2n-2k-3, n-k-2).
T(n, n-2) = n-2, T(n, k) = T(n, k+1) + T(n-1, k-1) + T(n-k, 2).
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EXAMPLE
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Full triangle begins:
0
0,0
0,0,0
1,1,0,0
6,6,2,0,0
27,27,12,3,0,0
110,110,55,19,4,0,0
429,429,229,91,27,5,0,0
1638,1638,912,393,136,36,6,0,0
6188,6188,3549,1614,612,191,46,7,0,0
23256,23256,13636,6447,2601,897,257,57,8,0,0
...
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PROG
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(PARI) for(n=1, 15, for(k=1, n-2, print1(binomial(2*n-k-1, n)-binomial(2*n-k-1, n+3)+binomial(2*n-2*k-2, n-k-4)-binomial(2*n-2*k-2, n-k-1)+binomial(2*n-2*k-3, n-k-4)-binomial(2*n-2*k-3, n-k-2)", ")))
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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