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Search: id:A084611
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| A084611 |
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a(n) = sum of absolute values of coefficients of (1+x-x^2)^n. |
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+0
3
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| 1, 3, 7, 13, 35, 83, 165, 367, 899, 1957, 3839, 9771, 22709, 43213, 102963, 255061, 525601, 1098339, 2798273, 6202969, 11746259, 29976073, 70898649, 140495779, 314391789, 787757461, 1688887719, 3337986541, 8583687613, 19647782463
(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-x^2)^n, k, x); S=S+abs(t)); print1(S", "))
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CROSSREFS
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Cf. A002426, A084600-A084610, A084612-A084615.
Sequence in context: A100382 A152981 A112040 this_sequence A078454 A023212 A106952
Adjacent sequences: A084608 A084609 A084610 this_sequence A084612 A084613 A084614
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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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