G.f. x*(x-1)*(x+1)^3/((2*x^3+x^2-1)*(x^4+1)). 0, 1, 2, 1, 2, 3, 2, 7, 10, 13, 26, 33, 50, 83, 114, 183, 282, 413, 650, 977, 1474, 2275
2 seqfan posts