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A088938 Occurrences of 2's in A088936. 4
2, 3, 5, 10, 27, 104, 541, 3498, 26615, 231172, 2250129, 24227486, 285705643, 3660694200, 50624828357, 751426146514, 11913622408671, 200919532718828, 3591112295892985, 67803855263483142, 1348467602319393299 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=2+(1/2)*sum(k=1, n, sum(i=0, k, i!)) (Benoit Cloitre and Claude Lenormand(claude.lenormand(AT)free.fr) )

CROSSREFS

Cf. A088936, A088937, A088939, A088940.

Sequence in context: A007695 A133662 A204518 * A000617 A132183 A003504

Adjacent sequences:  A088935 A088936 A088937 * A088939 A088940 A088941

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 25 2003

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.