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A115202 Fifth column of triangle A115193 (called C(1,2)). 2
1, 9, 67, 477, 3363, 23741, 168451, 1202685, 8641539, 62470141, 454164483, 3319054333, 24371503107, 179736723453, 1330803769347, 9889323810813, 73733148770307, 551423090098173, 4135500638060547 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Also one eighth of the fourth diagonal of triangle A115195, called Y(1,2).

FORMULA

a(n)= A115195(3+n,1+n)/8, n>=0.

G.f.: (-1 + 3*x + (1- 5*x + 2*x^2)*c(2*x))/(4*(1+x)*x^3), with the o.g.f. c(x) of A000108 (Catalan).

a(n)= A115193(4+n,4), n>=0.

CROSSREFS

Sequence in context: A105287 A163349 A016130 * A155592 A002051 A133120

Adjacent sequences:  A115199 A115200 A115201 * A115203 A115204 A115205

KEYWORD

nonn

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 03 2006

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.