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A138382
First differences of A138380. Second differences of A138377.
1
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
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
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