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Search: id:A067325
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A067325 Fourth column of triangle A067323. +0
2
5, 19, 66, 227, 785, 2739, 9646, 34268, 122706, 442510, 1605956, 5861481, 21502585, 79243395, 293246550, 1089264360, 4059928950, 15179606010, 56917649820, 213982542150, 806429435994, 3046017513198 (list; graph; listen)
OFFSET

0,1

COMMENT

Also fourth diagonal of triangle A028364.

FORMULA

a(n)= A067323(n+3, 3)= C(n+4)-(C(n+3)+C(n+2)+2*C(n+1)), C(n) := A000108(n) (Catalan).

G.f.: (c(x)^3)*(2+2*c(x)+c(x)^2), with c(x) g.f. of A000108 (Catalan).

CROSSREFS

Cf. A067324 (third column).

Adjacent sequences: A067322 A067323 A067324 this_sequence A067326 A067327 A067328

Sequence in context: A059509 A137745 A005021 this_sequence A121525 A035344 A114277

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 05 2002

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.


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