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A134661 Number of odd coefficients in (1+x+x^3)^n. +0
1
1, 3, 3, 7, 3, 9, 7, 13, 3, 9, 9, 19, 7, 21, 13, 27, 3, 9, 9, 21, 9, 27, 19, 35, 7, 21, 21, 41, 13, 39, 27, 55, 3, 9, 9, 21, 9, 27, 21, 39, 9, 27, 27, 55, 19, 57, 35, 73, 7, 21, 21, 49, 21, 63, 41, 75, 13, 39, 39, 79, 27, 81, 55, 109, 3, 9, 9, 21, 9, 27, 21, 39, 9, 27, 27, 57, 21, 63, 39 (list; graph; listen)
OFFSET

0,2

LINKS

S. Finch, P. Sebah and Z.-Q. Bai, Odd Entries in Pascal's Trinomial Triangle (arXiv:0802.2654)

MATHEMATICA

PolynomialMod[(1+x+x^3)^n, 2] /. x->1

CROSSREFS

Cf. A071053, A038717.

Adjacent sequences: A134658 A134659 A134660 this_sequence A134662 A134663 A134664

Sequence in context: A030316 A034257 A092693 this_sequence A135434 A069949 A143275

KEYWORD

nonn

AUTHOR

Steven Finch (Steven.Finch(AT)inria.fr), Jan 25 2008

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.


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