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A111417 a(n) = A034869(n) - A008311(n). 0
0, 0, 1, 0, 0, 0, 3, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 35, 0, 0, 0, 0, 0, 0, 0, 0, 0, 126, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 462, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1716, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6435, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 24310, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Table of n, a(n) for n=0..91.

FORMULA

a(n) = A001700(m) if n = (m+1)*(m+2) and a(n) = 0 otherwise.

CROSSREFS

Sequence in context: A094518 A123074 A095269 * A007271 A320179 A035656

Adjacent sequences:  A111414 A111415 A111416 * A111418 A111419 A111420

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Nov 13 2005

STATUS

approved

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Last modified January 23 02:34 EST 2019. Contains 319365 sequences. (Running on oeis4.)