A138382 First differences of A138380. Second differences of A138377.

1, -3, -1, -2, -4, 12, 4, 8, 16, -48, -16, -32, -64, 192, 64, 128, 256, -768, -256, -512, -1024, 3072, 1024, 2048, 4096, -12288, -4096, -8192, -16384, 49152, 16384, 32768, 65536, -196608, -65536, -131072, -262144, 786432, 262144, 524288, 1048576, -3145728

Offset

0,2

Links

Table of n, a(n) for n=0..41.

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

Formula

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

Mathematica

Differences[LinearRecurrence[{0, 0, 0, -4}, {0, 1, 3, 2}, 60], 2] (* Harvey P. Dale, Mar 19 2012 *)
LinearRecurrence[{0, 0, 0, -4}, {1, -3, -1, -2}, 42] (* Ray Chandler, Aug 03 2015 *)

Crossrefs

Sequence in context: A083275 A230892 A325671 * A123375 A021036 A354348

Adjacent sequences: A138379 A138380 A138381 * A138383 A138384 A138385

Keyword

sign

Author

Paul Curtz, May 08 2008

Extensions

Definition corrected by R. J. Mathar, May 09 2008

More terms from Harvey P. Dale, Mar 19 2012

Status

approved