A067305 Second column of triangle A067304.

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

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