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A027379
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Expansion of (1+x^2-x^3)/(1-x)^3.
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10
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1, 3, 7, 12, 18, 25, 33, 42, 52, 63, 75, 88, 102, 117, 133, 150, 168, 187, 207, 228, 250, 273, 297, 322, 348, 375, 403, 432, 462, 493, 525, 558, 592, 627, 663, 700, 738, 777, 817, 858, 900, 943, 987, 1032, 1078
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OFFSET
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0,2
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LINKS
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FORMULA
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PROG
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(Magma) [n eq 0 select 1 else n*(n+5)/2: n in [0..50]]; // G. C. Greubel, Jul 31 2022
(SageMath) [n*(n+5)/2 + bool(n==0) for n in (0..50)] # G. C. Greubel, Jul 31 2022
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CROSSREFS
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Essentially the triangular numbers (A000217) minus 3.
Also essentially the same as A055998.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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