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A099175 a(1) = 1, a(2) = 8; for n > 2: a(n) = a(n-1)*(3*a(n-1)-2). 1
1, 8, 176, 92576, 25710762176, 1983129874961075240576, 11798412302889389755255045998938726679954176, 417607598606915139792416465578985202696175989567316713156694229302007260054247019608576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

n*(3n-2) is the n-th octagonal number (A000567).

LINKS

Table of n, a(n) for n=1..8.

MATHEMATICA

Join[{1}, NestList[ #*(3*# - 2) &, 8, 7]]

CROSSREFS

Sequence in context: A221631 A064342 A251578 * A000839 A001596 A221115

Adjacent sequences:  A099172 A099173 A099174 * A099176 A099177 A099178

KEYWORD

nonn

AUTHOR

Jonathan Vos Post, Nov 15 2004

EXTENSIONS

Edited by Stefan Steinerberger, Jul 25 2007

STATUS

approved

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Last modified December 7 09:33 EST 2019. Contains 329843 sequences. (Running on oeis4.)