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A011881 [ n(n-1)/28 ]. 0
0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 40, 42, 45, 47, 50, 52, 55, 58, 61, 64, 67, 70, 73, 77, 80, 84, 87, 91, 94, 98, 102, 106, 110, 114, 118 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Table of n, a(n) for n=0..58.

FORMULA

G.f.: (x^6 (-1-(-1+x) x (1+(-1+x) x) (1+x^2) (1+x+x^2) (1-x^2+x^4)))/(-1+x (2+x (-1+(-1+x)^2 x^5 (1-x^7+x^14)))) Peter J. C. Moses, Jun 01 2014

CROSSREFS

Sequence in context: A062049 A025764 A237119 * A076678 A029024 A328188

Adjacent sequences:  A011878 A011879 A011880 * A011882 A011883 A011884

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)