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A011885 [ n(n-1)/32 ]. 0
0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 46, 48, 51, 53, 56, 59, 61, 64, 67, 70, 73, 76, 79, 82, 86, 89, 92, 96, 99, 103, 106, 110, 114, 118, 122, 126, 130, 134, 138, 142, 146, 150 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,10

LINKS

Table of n, a(n) for n=0..70.

FORMULA

G.f.: x^7(1+x^2-x^3+x^4+x^9+x^14+x^19-x^20+x^21+x^23)/((1-x)(1-x^3)(1-x^32));

PROG

(PARI) a(n)=if(n<0, 0, (n^2-n)\32)

CROSSREFS

Sequence in context: A051068 A050294 A097950 * A211524 A008672 A097923

Adjacent sequences:  A011882 A011883 A011884 * A011886 A011887 A011888

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 24 10:42 EST 2020. Contains 331193 sequences. (Running on oeis4.)