2580480

Appears in sequences

• a(n) = n^2 * n!.at n=8A002775
• Order of a certain Clifford group in dimension 2^n (the automorphism group of the Barnes-Wall lattice for n != 3).at n=3A014115
• a(n) = n! * C(n+2, 2) * 2^(n+1).at n=6A014297
• a(n) = (4*n+8)(!^4)/8(!^4), related to A034177(n+1) ((4*n+4)(!^4) quartic, or 4-factorials).at n=5A051620
• Number of ordered labeled rooted trees on n nodes with non-leaf nodes having more than two children.at n=8A052524
• Expansion of e.g.f. x*(1-x)/(1-2*x).at n=8A052564
• E.g.f. x^2*(1+x-2x^2)/(1-2x).at n=8A052638
• a(0) = 2, a(n) = 2^(n+1)*(n-1)! (n >= 1).at n=8A064378
• Number of symmetric n X n conference matrices.at n=9A086260
• Number of n X n conference matrices (including both symmetric and antisymmetric).at n=9A086262
• Triangle T(n,k) read by rows: number of permutations in S_n avoiding all k-length patterns starting with fixed m, 2<k<=n, 1<=m<=k.at n=42A104001
• T(i,j) = (-1)^(i+j)*(i+1)*binomial(i,j)*2^(i-j)*4^j.at n=40A137337
• A triangular sequence from coefficients of an expansion of the Poisson's kernel: p(t,r)=(1-r^2)/(1-2*r*Cos(t)+r^2): r->t;Cos(t)->x.at n=38A137511
• The decomposition of a certain labeled universe (A052584), triangle read by rows.at n=34A159749
• Number of permutations of 1..n with i-9<=p(i)<=i+7.at n=9A179360
• Number of permutations of 1..n with i-10<=p(i)<=i+7.at n=9A179367
• G.f.: 1 + x = Sum_{n>=0} a(n)*x^n*(1-2^n*x)^n.at n=6A179472
• a(n) = 2^((n^2-n-2)/2)*(n+2)!at n=5A185970
• Where records occur in A222084.at n=34A222089
• Maximum size of a main class for diagonal Latin squares of order n with the first row in ascending order.at n=13A299784