3521385

Appears in sequences

• Galton triangle T(n, k) = T(n-1, k-1) + (3k-2)*T(n-1, k) read by rows.at n=49A111577
• a(n) = 1 + F(2*n+1) - (F(n+4) - (-1)^n*F(n-2))/2 where F=A000045.at n=16A330051