20470

Appears in sequences

• Sum of binary numbers with n 1's and one (possibly leading) 0.at n=10A059672
• Denominators of expansion of e.g.f. x^2/(2*(cos(x)-1)), even powers only.at n=44A132095
• Number of spanning hypertrees with n unlabeled vertices: analog of A035053 when edges of size 1 are allowed (with no two equal edges).at n=8A134959
• Number of reduced words of length n in Coxeter group on 5 generators S_i with relations (S_i)^2 = (S_i S_j)^7 = I.at n=7A164354
• Position of 5^n in A051037 (5-smooth numbers).at n=32A188427
• Number of nX(n+4) arrays of permutations of n+4 copies of 0..n-1 with every element equal to or 1 greater than any north, west or northeast neighbors modulo n and the upper left element equal to 0.at n=4A267396
• Number of 5Xn arrays containing n copies of 0..5-1 with every element equal to or 1 greater than any north, west or northeast neighbors modulo 5 and the upper left element equal to 0.at n=8A267398
• a(0) = 1, a(n) = (denominator of the Bernoulli number B_{2n})/3, for n>=1.at n=44A277087
• Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.at n=17A297882
• G.f.: Sum_{k>=0} (1 + k*x)^k * x^(2*k).at n=16A360699