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A230539 a(n) = 3*n*2^(3*n-1). 3
0, 12, 192, 2304, 24576, 245760, 2359296, 22020096, 201326592, 1811939328, 16106127360, 141733920768, 1236950581248, 10720238370816, 92358976733184, 791648371998720, 6755399441055744, 57420895248973824, 486388759756013568, 4107282860161892352 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Arithmetic derivative of 8^n: a(n) = A003415(8^n).

Sum of reciprocals of a(n), for n>0: (2/3)*log(8/7).

LINKS

Bruno Berselli, Table of n, a(n) for n = 0..100

Index entries for linear recurrences with constant coefficients, signature (16,-64).

FORMULA

G.f.: 12*x/(1-8*x)^2.

a(n) = 12*A053539(n).

MAPLE

A230539:=n->3*n*2^(3*n-1): seq(A230539(n), n=0..30); # Wesley Ivan Hurt, May 03 2017

MATHEMATICA

Table[3 n 2^(3 n - 1), {n, 0, 20}]

PROG

(MAGMA) [3*n*2^(3*n-1): n in [0..20]];

(PARI) a(n) = 3*n*2^(3*n-1); \\ Michel Marcus, Oct 23 2013

CROSSREFS

Cf. A001018, A003415.

Cf. arithmetic derivative of k^n: A001787 (k=2), A027471 (k=3), A018215 (k=4), A053464 (k=5), A212700 (k=6), A027473 (k=7), this sequence, A230540 (k=9), A085708 (k=10), A081127 (k=11).

Row n=8 of A258997.

Sequence in context: A196483 A196716 A086948 * A230750 A212596 A051620

Adjacent sequences:  A230536 A230537 A230538 * A230540 A230541 A230542

KEYWORD

nonn,easy

AUTHOR

Bruno Berselli, Oct 23 2013

STATUS

approved

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Last modified August 17 22:32 EDT 2018. Contains 313817 sequences. (Running on oeis4.)