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Search: id:A084613
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| A084613 |
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a(n) = sum of absolute values of coefficients of (1+x-2x^2)^n. |
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+0
3
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| 1, 4, 14, 44, 124, 394, 1418, 4706, 14322, 40712, 135878, 468934, 1513650, 4502864, 13421408, 45258442, 152708520, 483810550, 1413811358, 4483843328, 15051967962, 49724234652, 154802614364, 461020649750, 1486736569982
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) for(n=0, 40, S=0; for(k=0, 2*n, t=polcoeff((1+x-2*x^2)^n, k, x); S=S+abs(t)); print1(S", "))
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CROSSREFS
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Cf. A002426, A084600-A084612, A084614-A084615.
Sequence in context: A095377 A049539 A037528 this_sequence A099063 A057223 A007466
Adjacent sequences: A084610 A084611 A084612 this_sequence A084614 A084615 A084616
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jun 01 2003
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