

A291983


Expansion of 1/((1+x)*(1+x^2)*(1+x^3)).


3



1, 1, 0, 1, 2, 1, 1, 2, 2, 2, 2, 2, 3, 3, 2, 3, 4, 3, 3, 4, 4, 4, 4, 4, 5, 5, 4, 5, 6, 5, 5, 6, 6, 6, 6, 6, 7, 7, 6, 7, 8, 7, 7, 8, 8, 8, 8, 8, 9, 9, 8, 9, 10, 9, 9, 10, 10, 10, 10, 10, 11, 11, 10, 11, 12, 11, 11, 12, 12, 12, 12
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OFFSET

0,5


LINKS

Table of n, a(n) for n=0..70.
Index entries for linear recurrences with constant coefficients, signature (1, 1, 2, 1, 1, 1).


MATHEMATICA

CoefficientList[Series[1/((1+x)(1+x^2)(1+x^3)), {x, 0, 70}], x] (* or *) LinearRecurrence[ {1, 1, 2, 1, 1, 1}, {1, 1, 0, 1, 2, 1}, 80] (* Harvey P. Dale, Jun 12 2022 *)


PROG

(PARI) Vec(1/((1+x)*(1+x^2)*(1+x^3)) + O(x^100))


CROSSREFS

Cf. A112689, A291954, A291984, A291985.
Sequence in context: A025839 A053261 A123584 * A112689 A298604 A190353
Adjacent sequences: A291980 A291981 A291982 * A291984 A291985 A291986


KEYWORD

sign


AUTHOR

Seiichi Manyama, Sep 07 2017


STATUS

approved



