220222

Appears in sequences

• Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 1.at n=17A257608
• Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 1.at n=18A257608
• Expansion of g/(1 - x^4*g^2), where g = 1+x*g^2 is the g.f. of A000108.at n=12A391032