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A014938 a(1)=1, a(n)=n*21^(n-1)+a(n-1). 1
1, 43, 1366, 38410, 1010815, 25515421, 625878268, 15034586596, 355440320845, 8298240786655, 191776931546866, 4395106938053518, 100020864586079851, 2262634152933752305, 50921433140756382520, 1140878530467983299336 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

FORMULA

a(n)=(1/400)*[1+21^n*(20*n-1)], with n>=0 [From Paolo P. Lava, Jan 13 2009]

CROSSREFS

Sequence in context: A214100 A229432 A122575 * A235646 A022220 A297028

Adjacent sequences:  A014935 A014936 A014937 * A014939 A014940 A014941

KEYWORD

nonn,easy

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified April 25 23:48 EDT 2019. Contains 322465 sequences. (Running on oeis4.)