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A256136 a(n) = 6^A000120(n). 2
1, 6, 6, 36, 6, 36, 36, 216, 6, 36, 36, 216, 36, 216, 216, 1296, 6, 36, 36, 216, 36, 216, 216, 1296, 36, 216, 216, 1296, 216, 1296, 1296, 7776, 6, 36, 36, 216, 36, 216, 216, 1296, 36, 216, 216, 1296, 216, 1296, 1296, 7776, 36, 216, 216, 1296, 216, 1296, 1296, 7776, 216, 1296, 1296, 7776, 1296, 7776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also, a row of the square array A256140.

It appears that when A151784 is regarded as a triangle in which the row lengths are the powers of 2, this is what the rows converge to.

LINKS

Table of n, a(n) for n=0..61.

FORMULA

a(n) = A000400(A000120(n)). - Michel Marcus, Mar 21 2015

G.f.: Product_{k>=0} (1 + 6*x^(2^k)). - Ilya Gutkovskiy, Feb 28 2017

EXAMPLE

Also, written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:

1;

6;

6, 36;

6, 36, 36, 216;

6, 36, 36, 216, 36, 216, 216, 1296;

...

MATHEMATICA

6^# & /@ Nest[Join[#, # + 1] &, {0}, 6] (* Michael De Vlieger, Mar 20 2015, after IWABUCHI Yu(u)ki at a000120 *)

PROG

(PARI) a(n) = 6^hammingweight(n); \\ Michel Marcus, Mar 21 2015

CROSSREFS

Cf. A000120, A001316, A048883, A102376, A116522, A151784, A256135, A256140, A256141.

Sequence in context: A015699 A244416 A165827 * A111437 A056464 A056454

Adjacent sequences:  A256133 A256134 A256135 * A256137 A256138 A256139

KEYWORD

nonn

AUTHOR

Omar E. Pol, Mar 19 2015

EXTENSIONS

More terms from Michael De Vlieger, Mar 20 2015

STATUS

approved

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Last modified May 22 18:53 EDT 2019. Contains 323481 sequences. (Running on oeis4.)