A137399 a(n)=4a(n-4).

1, 2, 2, 1, 4, 8, 8, 4, 16, 32, 32, 16, 64, 128, 128, 64, 256, 512, 512, 256, 1024, 2048, 2048, 1024, 4096, 8192, 8192, 4096, 16384, 32768, 32768, 16384, 65536, 131072, 131072, 65536, 262144, 524288, 524288, 262144, 1048576, 2097152, 2097152, 1048576, 4194304

Offset

0,2

Links

Table of n, a(n) for n=0..44.

Index entries for linear recurrences with constant coefficients, signature (0,0,0,4).

Prog

(PARI) a(n)=[1, 2, 2, 1][n%4+1]*4^(n\4) \\ Charles R Greathouse IV, Oct 17 2013

Crossrefs

Sequence in context: A167622 A084606 A304209 * A158985 A295687 A087854

Adjacent sequences: A137396 A137397 A137398 * A137400 A137401 A137402

Keyword

nonn,easy

Author

Paul Curtz, Apr 21 2008

Extensions

More terms from Charles R Greathouse IV, Oct 17 2013

Status

approved