9686617domain: NAppears in sequencesa(n) = T(2n,n), T given by A026725.at n=12A026726Greatest number in row n of array T given by A026725.at n=24A026731Expansion of 1/(1-x-x^3*c(x^3)), c(x) the g.f. of A000108.at n=36A165407