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Search: id:A048121
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A048121 a(n)=(1/2)*T(2n,n+1), where T is given by A048113. +0
1
0, 0, 1, 3, 12, 42, 156, 570, 2124, 7926, 29844, 112812, 428712, 1635108, 6259236, 24031260, 92517180, 357019224, 1380671532, 5349496152, 20762603724, 80709201504, 314178212928, 1224576411084, 4778651920092, 18667769062044 (list; graph; listen)
OFFSET

1,4
CROSSREFS

Sequence in context: A067819 A094970 A065179 this_sequence A066987 A012873 A167477

Adjacent sequences: A048118 A048119 A048120 this_sequence A048122 A048123 A048124

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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