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A091618 Column 4 of triangle A091613. 0
1, 0, 2, 4, 10, 22, 46, 101, 218, 466, 991, 2093, 4405, 9232, 19288, 40169, 83416, 172806, 357170, 736710, 1516714, 3117133, 6396116, 13105012, 26814264, 54795330, 111842771, 228030558, 464439943, 945029466, 1921169854 (list; graph; refs; listen; history; internal format)
OFFSET

4,3

CROSSREFS

Sequence in context: A023036 A005306 A075898 * A181158 A018108 A033497

Adjacent sequences:  A091615 A091616 A091617 * A091619 A091620 A091621

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Jan 23 2004

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.