23224320

Appears in sequences

• a(n) = (n+1)!/2 + (n-1)(n-1)!.at n=9A000780
• Theta series of 16-dimensional Barnes-Wall lattice.at n=7A008409
• Theta series of (probably nonexistent) exceptionally good 16-dimensional sphere packing.at n=14A008774
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*8^j.at n=31A038262
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*6^j.at n=32A038284
• a(n) = (2*n+4)!!/4!!, related to A000165 (even double factorials).at n=7A051578
• Number of 5-colored labeled graphs on n nodes (divided by 1024).at n=7A052263
• Expansion of e.g.f. x^2*(1-x)/(1-2*x).at n=9A052587
• Triangle T(n,k) = C_n(k)/2^(k*(k-1)/2) where C_n(k) = number of k-colored labeled graphs with n nodes (n >= 1, 1 <= k <= n).at n=32A058875
• Integers of the form phi(n!)/phi(n)!.at n=6A068114
• A077175(n) / A077176(n).at n=10A100918
• A101177(n) / A101178(n).at n=10A101179
• a(1) = 1; for n>1, a(n) = Sum_{i=1..n-1} a(i)*prime(i).at n=8A109664
• Startorial numbers: product of initial digits of integers 1 through n.at n=24A109834
• A triangular sequence based on expansion of the rational polynomial of A001788 as a Sheffer sequence: p(x,t)=Exp[x*t]*(-1/(2*t - 1)^3).at n=28A138192
• Triangle read by rows: T(n,k) = n!*2^k/(n-k)! (n >= 0, 0 <= k <= n).at n=52A161381
• a(n) = (4*n)!*((2*n)!)^2.at n=2A163494
• Theta series of 16-dimensional lattice OBW16, an overlattice of the Barnes-Wall lattice BW16.at n=14A239917
• Irregular triangle T(n,m), denominators of coefficients in a power/Fourier series expansion of the plane pendulum's exact time dependence.at n=12A274131
• Number of double-closed subsets of {1..n}.at n=33A308546