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A133331
a(2n+1) = 3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2) = 3a(2n+1)-3a(2n), a(0) = 0, a(1) = 1, a(2) = 3.
0
0, 1, 3, 6, 9, 15, 18, 27, 27, 36, 27, 27, 0, -27, -81, -162, -243, -405, -486, -729, -729, -972, -729, -729, 0, 729, 2187, 4374
OFFSET
0,3
CROSSREFS
Sequence in context: A342594 A179893 A274191 * A276381 A259728 A000741
KEYWORD
sign
AUTHOR
Paul Curtz, Oct 19 2007
STATUS
approved