19030

Appears in sequences

• Matrix 10th power of partition triangle A008284.at n=38A050304
• Numbers k such that 171*2^k-1 is prime.at n=33A050837
• Sum of squares of entries of Wilkinson's eigenvalue test matrix of order 2n+1.at n=30A059834
• Number of Bottleneck-Monge matrices with 4 rows.at n=5A070052
• Number of Bottleneck-Monge matrices with 6 rows.at n=3A070054
• Matrix square of triangle A104980.at n=30A104988
• Antidiagonal sums of square array A108553, in which row n equals the crystal ball sequence for D_n lattice.at n=9A108555
• Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation with no more than 1 one in any 4 X 4 X 4 subtriangle.at n=19A153902
• 1/16 the number of (n+1) X 7 0..3 arrays with all 2 X 2 subblocks having the same four values.at n=11A184036
• Permutation of natural numbers, odd bisection of A245706 incremented by one and halved: a(n) = (1+A245706((2*n)-1)) / 2.at n=56A245712
• T(n,k) is the number of simply connected square animals with n cells and k internal vertices (0 <= k <= A083479(n)), triangle read by rows.at n=34A308300
• Numbers m such that m^2+1 is prime with (m-1)^2+1 and (m+1)^2+1 semiprimes.at n=34A321795
• Number of n edge connected achiral planar maps with an external face in which all internal faces are triangles.at n=23A378342