56080

Appears in sequences

• T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock nonsingular and the array of 2X2 subblock determinants symmetric about the diagonal and antidiagonal.at n=16A187670
• Number of 3X3 0..n arrays with each 2X2 subblock nonsingular and the array of 2X2 subblock determinants symmetric about the diagonal and antidiagonal.at n=4A187671
• Numbers k such that (14*10^k - 143)/3 is prime.at n=22A279050
• Expansion of Product_{k>=1} (1 - x^k * (k + x)).at n=33A336977
• G.f. A(x) satisfies A(x) = 1/(1 - x * A(x*A(x)^3)^3).at n=6A381615