20730

Appears in sequences

• Related to population of numbers of form x^2 + y^2.at n=16A000709
• T(n, 2*n-3), T given by A027960.at n=47A027965
• Number of rooted trees with n nodes and 6 leaves.at n=8A055281
• a(n) = 36*n^2 - 6.at n=23A158462
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.at n=20A192758
• Principal diagonal of the convolution array A213778.at n=38A213779
• Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the medians of the diagonal and antidiagonal minus the two sums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=2A255750
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of the medians of the diagonal and antidiagonal minus the two sums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=8A255756
• Number of (3+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the medians of the diagonal and antidiagonal minus the two sums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=1A255758
• Number of partitions of (2, n) into a sum of distinct pairs.at n=36A268345
• Determinant of n X n Hankel matrix whose entries are 1-A010060(i+j), where A010060 is the Thue-Morse sequence.at n=29A274330
• Expansion of (1/(1 - x))*Product_{k>=1} (1 - x^(3*k))/(1 - x^k).at n=36A304630
• a(n) = F(n+4) * F(n+2) + 7 * (-1)^n where F(n) = A000045(n) are the Fibonacci numbers.at n=8A341928