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A154381
Row sums of Bell related number triangle A154380.
1
1, 2, 6, 20, 72, 276, 1120, 4804, 21796, 104784, 534788, 2901580, 16742440, 102654356, 667519492, 4590552960, 33278208004, 253436345340, 2020974497112, 16823488830836, 145798111066964, 1312272490908464
OFFSET
0,2
COMMENTS
a(n) = 2*A129247(n), n>0. Hankel transform is 2^n*A000178(n).
FORMULA
G.f.: 1/(1-2x/(1-x/(1-x/(1-2x/(1-x/(1-3x/(1-x/(1-4x/(1-... (continued fraction).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jan 08 2009
STATUS
approved