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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
OFFSET
0,7
FORMULA
a(n) = A001700(m) if n = (m+1)*(m+2) and a(n) = 0 otherwise.
CROSSREFS
Sequence in context: A356302 A308275 A308254 * A007271 A327449 A320179
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Nov 13 2005
STATUS
approved