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A067325 Fourth column of triangle A067323. 1
5, 19, 66, 227, 785, 2739, 9646, 34268, 122706, 442510, 1605956, 5861481, 21502585, 79243395, 293246550, 1089264360, 4059928950, 15179606010, 56917649820, 213982542150, 806429435994, 3046017513198 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Also fourth diagonal of triangle A028364.

LINKS

Table of n, a(n) for n=0..21.

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).

Sequence in context: A059509 A137745 A005021 * A273599 A121525 A163872

Adjacent sequences:  A067322 A067323 A067324 * A067326 A067327 A067328

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Feb 05 2002

STATUS

approved

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Last modified June 1 02:09 EDT 2020. Contains 334758 sequences. (Running on oeis4.)