login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A077900
Expansion of (1-x)^(-1)/(1+x-2*x^2+2*x^3).
0
1, 0, 3, -4, 11, -24, 55, -124, 283, -640, 1455, -3300, 7491, -17000, 38583, -87564, 198731, -451024, 1023615, -2323124, 5272403, -11965880, 27156935, -61633500, 139879131, -317460000, 720485263, -1635163524, 3711054051, -8422351624, 19114786775, -43381598124, 98455874923
OFFSET
0,3
FORMULA
A077970(n) = a(n)-a(n-1). - R. J. Mathar, Feb 28 2019
CROSSREFS
Sequence in context: A131481 A001072 A292623 * A208176 A198443 A041231
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved