34552domain: NAppears in sequencesa(1)=a(2)=1, a(n) = (a(n-1)+1)*(a(n-2)+1) for n > 2.at n=6A096423a(n) = 6*a(n-1) - 2*a(n-2) for n>1; a(1)=1, a(2)=6.at n=6A154244Expansion of x*(1+5*x-2*x^3)/(1-6*x^2+2*x^4).at n=12A249221a(n) = A255302(2^n - 1).at n=8A255303Self-convolution of A257889.at n=11A265226