39056

Appears in sequences

• a(n) = Sum_{i=0..n} T(i,n-i) where T is given by A047020.at n=17A047021
• Numbers k such that [A070080(k), A070081(k), A070082(k)] is a right integer triangle with relatively prime side lengths.at n=11A070137
• Numbers n such that n^2048 + 1 is prime (a generalized Fermat prime).at n=17A088361
• Row sums of triangle A091039 (scaled second columns of (k,k)-Stirling2 arrays).at n=5A091040
• E.g.f. A(x) satisfies A( x/(exp(2*x)*cosh(2*x)) ) = exp(x)*cosh(x).at n=5A218303
• Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=31A259002
• Number of figure 8's having 2n edges in one loop and 6 edges in the other and which are weakly embeddable in the square lattice.at n=6A323853
• a(n) = (n^3+5*n+3)/3 + 2*floor(n/2) + a(n-2), with a(0)=1 and a(1)=3.at n=30A336529