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A161738 Sequence related to the column sums of the BG2 matrix 3
1, 1, 3, 15, 35, 315, 693, 9009, 19305, 328185, 692835, 14549535, 30421755, 760543875, 1579591125, 45808142625, 94670161425, 3124115327025, 6432002143875, 237984079323375, 488493636505875, 20028239096740875 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

a(n) = product((2*n-3-2*k), k=0..floor(n/2-1))

numer(a(n+2)/a(n+1)) = A005408(n) for n=>0.

denom(a(n+2)/a(n+1)) = A093178(n) for n=>0..

CROSSREFS

Cf. A161736, A005408 and A093178.

Sequence in context: A019009 A162441 A001803 * A062741 A185541 A176661

Adjacent sequences:  A161735 A161736 A161737 * A161739 A161740 A161741

KEYWORD

easy,nonn

AUTHOR

Johannes W. Meijer (meijgia(AT)hotmail.com), Jun 18 2009

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.