A025826 - OEIS

A025826

Expansion of 1/((1-x^2)*(1-x^10)*(1-x^11)).

1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 2, 4, 2, 4, 2, 4, 2, 4, 2, 5, 3, 6, 4, 6, 4, 6, 4, 6, 4, 7, 5, 8, 6, 9, 6, 9, 6, 9, 6, 10, 7, 11, 8, 12, 9, 12, 9, 12, 9, 13, 10, 14, 11, 15, 12, 16, 12, 16, 12, 17, 13, 18

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OFFSET

0,11

COMMENTS

Number of partitions of n into parts 2, 10, and 11. - Hoang Xuan Thanh, Sep 03 2025

LINKS

Table of n, a(n) for n=0..72.

Index entries for linear recurrences with constant coefficients, signature (0,1,0,0,0,0,0,0,0,1,1,-1,-1,0,0,0,0,0,0,0,-1,0,1).

FORMULA

a(n) = floor((n^2 + 23*n + 11*(n+9)*(-1)^n + 356 +9*(2*((n+2) mod 10) - 2*(n mod 10) +((n+4) mod 10) - ((n+8) mod 10)))/440). - Hoang Xuan Thanh, Sep 03 2025

CROSSREFS

Sequence in context: A078313 A354601 A025827 * A161235 A161059 A161263

Adjacent sequences: A025823 A025824 A025825 * A025827 A025828 A025829

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved