A067305 - OEIS

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A067305

Second column of triangle A067304.

1, 5, 36, 328, 3440, 39408, 478912, 6068480, 79315200, 1061628160, 14480086016, 200540018688, 2812618092544, 39867889037312, 570237130752000, 8219880968028160, 119293333282291712, 1741605394647416832

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

FORMULA

a(n)= A067304(n+1, 1) = A067297(n+1) - A064340(n+1), n>=0.

G.f.: 4*(3+c(4*x))*(c(4*x)^3)/(1+c(4*x))^4 with c(x) g.f. of A000108 (Catalan).

CROSSREFS

Sequence in context: A187827 A291688 A300987 * A000806 A278990 A127132

Adjacent sequences: A067302 A067303 A067304 * A067306 A067307 A067308

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Feb 05 2002

STATUS

approved