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A084615
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a(n) = sum of absolute values of coefficients of (1+x-3x^2)^n.
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17
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1, 5, 23, 99, 401, 1525, 6345, 27331, 122083, 520805, 2117293, 8301441, 34517395, 147850771, 628707981, 2675100397, 10920387779, 43701876543, 180872758207, 769658883325, 3243501133481, 13617178197183, 56148348498199
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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PROG
| (PARI) for(n=0, 40, S=0; for(k=0, 2*n, t=polcoeff((1+x-3*x^2)^n, k, x); S=S+abs(t)); print1(S", "))
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CROSSREFS
| Cf. A002426, A084600-A084614.
Sequence in context: A055489 A109765 A119012 * A181331 A196489 A049674
Adjacent sequences: A084612 A084613 A084614 * A084616 A084617 A084618
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Jun 01 2003
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