204205

Appears in sequences

• Crystal ball sequence for D_6 lattice.at n=6A008358
• Triangle of Gaussian binomial coefficients [ n,k ] for q = 21.at n=16A022185
• Triangle of Gaussian binomial coefficients [ n,k ] for q = 21.at n=19A022185
• Expansion of 1/((1-2x)(1-3x)(1-4x)(1-5x)).at n=6A025211
• a(n) = n^4 + n^3 + n^2 + n + 1.at n=21A053699
• Numbers n for which there are exactly eight k such that n = k + (product of nonzero digits of k).at n=4A096929
• Main diagonal of square array A108553, in which row n equals the crystal ball sequence for D_n lattice.at n=6A108554
• Triangle read by rows: matrix product of the Stirling numbers of the second kind with the binomial coefficients.at n=51A126351
• Triangle read by rows: 2-Stirling numbers of the second kind.at n=48A143494
• a(n) = (21^n - 1)/20.at n=5A218724