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A176625
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T(n,k) = 1 + 3*k*(k - n), triangle read by rows (n >= 0, 0 <= k <= n).
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2
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1, 1, 1, 1, -2, 1, 1, -5, -5, 1, 1, -8, -11, -8, 1, 1, -11, -17, -17, -11, 1, 1, -14, -23, -26, -23, -14, 1, 1, -17, -29, -35, -35, -29, -17, 1, 1, -20, -35, -44, -47, -44, -35, -20, 1, 1, -23, -41, -53, -59, -59, -53, -41, -23, 1, 1, -26, -47, -62, -71, -74, -71, -62, -47
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OFFSET
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0,5
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins:
1;
1, 1;
1, -2, 1:
1, -5, -5, 1;
1, -8, -11, -8, 1;
1, -11, -17, -17, -11, 1;
1, -14, -23, -26, -23, -14, 1;
1, -17, -29, -35, -35, -29, -17, 1;
1, -20, -35, -44, -47, -44, -35, -20, 1;
1, -23, -41, -53, -59, -59, -53, -41, -23, 1;
1, -26, -47, -62, -71, -74, -71, -62, -47, -26, 1;
...
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MATHEMATICA
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a[n_] = n*(3*n - 1)/2; (* A000326 *)
t[n_, m_] = 1 - a[n] + a[m] + a[n - m];
Table[Table[t[n, m], {m, 0, n}], {n, 0, 10}];
Flatten[%]
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PROG
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(Magma) / * As triangle */ [[1 + 3*k*(k - n): k in [0..n]]: n in [0.. 15]]; // Vincenzo Librandi, Nov 26 2018
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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