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A098582 Expansion of (1+2x+4x^2+8x^3)/(1-x-16x^5). 1
1, 3, 7, 15, 15, 31, 79, 191, 431, 671, 1167, 2431, 5487, 12383, 23119, 41791, 80687, 168479, 366607, 736511, 1405167, 2696159, 5391823, 11257535, 23041711, 45524383, 88662927, 174932095, 355052655, 723720031, 1452110159, 2870716991 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)=a(n-1)+16a(n-5); a(n)=sum{k=0..n, binomial(n-k, floor(k/4))2^k}.

CROSSREFS

Sequence in context: A135374 A117589 A143703 * A089432 A111294 A092899

Adjacent sequences:  A098579 A098580 A098581 * A098583 A098584 A098585

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Sep 16 2004

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Last modified February 16 14:07 EST 2012. Contains 205930 sequences.