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, 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

Links

Table of n, a(n) for n=0..27.

Crossrefs

Sequence in context: A342594 A179893 A274191 * A276381 A259728 A000741

Adjacent sequences: A133328 A133329 A133330 * A133332 A133333 A133334

Keyword

sign

Author

Paul Curtz, Oct 19 2007

Status

approved