-19601

Appears in sequences

• Expansion of g.f. (1+x)*(3+x)/(1+6*x^2+x^4).at n=10A100434
• Values of n such that L(14) and N(14) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=48A227517