OFFSET
1,2
COMMENTS
Apart from initial term, identical to A130773 if offsets are ignored. - R. J. Mathar, May 11 2008
FORMULA
A007318 * [1, 1, 2, -3, 4, -5, 6, -7, ...]. Sums of antidiagonal terms of the following array: 1, 1, 1, 1, 1, ... 1, 3, 5, 7, 9, ... 1, 1, 1, 1, 1, ...
O.g.f.: x(1+2x^2-x^3)/(1-x)^2. - R. J. Mathar, May 11 2008
EXAMPLE
a(4) = 7 = (1, 3, 3, 1) dot (1, 1, 2, -3) = (1 + 3 + 6 - 3).
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, May 09 2008
STATUS
approved