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A067419 Fourth column of triangle A067417. 7
1, 6, 72, 864, 10368, 124416, 1492992, 17915904, 214990848, 2579890176, 30958682112, 371504185344, 4458050224128, 53496602689536, 641959232274432, 7703510787293184, 92442129447518208, 1109305553370218496 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..900

FORMULA

a(n)= A067417(n+3, 3). a(n)= 6*(3*4)^(n-1), n>=1, a(0)=1.

G.f.: (1-6x)/(1-12*x).

a(n)= Sum_{k, 0<=k<=n} A134309(n,k)*6^k = Sum_{k, 0<=k<=n} A055372(n,k)*5^k. - Philippe Deléham, Feb 04 2012

PROG

(MAGMA) [Ceiling(6*(3*4)^(n-1)): n in [0..20]]; // Vincenzo Librandi, Oct 02 2011

CROSSREFS

Cf. A067403 (third column), A067420 (fifth column), A001021 (powers of 12).

Sequence in context: A105928 A186665 A007031 * A113331 A214159 A237021

Adjacent sequences:  A067416 A067417 A067418 * A067420 A067421 A067422

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Jan 25 2002

STATUS

approved

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Last modified June 27 11:25 EDT 2017. Contains 288788 sequences.