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A091622 Column 1 of triangle A091615. 1
1, 2, 6, 11, 26, 61, 132, 290, 638, 1390, 3012, 6496, 13940, 29793, 63450, 134628, 284764, 600596, 1263304, 2650684, 5549117, 11592553, 24170837, 50306424, 104527509, 216852455, 449232326, 929378744, 1920295902, 3963077103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Sequence in context: A191307 A007186 A033304 * A191315 A184884 A275222

Adjacent sequences:  A091619 A091620 A091621 * A091623 A091624 A091625

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jan 23 2004

STATUS

approved

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Last modified November 21 04:56 EST 2019. Contains 329350 sequences. (Running on oeis4.)