



1, 1, 4, 1, 4, 4, 16, 1, 4, 4, 16, 4, 16, 16, 64, 1, 4, 4, 16, 4, 16, 16, 64, 4, 16, 16, 64, 16, 64, 64, 256, 1, 4, 4, 16, 4, 16, 16, 64, 4, 16, 16, 64, 16, 64, 64, 256, 4, 16, 16, 64, 16, 64, 64, 256, 16, 64, 64, 256, 64, 256, 256, 1024, 1, 4, 4, 16, 4, 16, 16, 64, 4, 16, 16, 64, 16, 64
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OFFSET

1,3


LINKS

Table of n, a(n) for n=1..77.


EXAMPLE

Contribution from Omar E. Pol, Jul 21 2009: (Start)
If written as a triangle:
1;
1,4;
1,4,4,16;
1,4,4,16,4,16,16,64;
1,4,4,16,4,16,16,64,4,16,16,64,16,64,64,256;
1,4,4,16,4,16,16,64,4,16,16,64,16,64,64,256,4,16,16,64,16,64,64,256,16,64,...
(End)


MAPLE

Cf. A048896, A147610, A151780.


CROSSREFS

Cf. A000302, A102376. [From Omar E. Pol, Jul 21 2009]
A102376 is a very similar sequence.
Sequence in context: A035646 A144034 A204714 * A258853 A275791 A093561
Adjacent sequences: A151780 A151781 A151782 * A151784 A151785 A151786


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Jun 25 2009


STATUS

approved



