40480

Appears in sequences

• a(n) is the number of Dyck paths of semilength n+6 having its first peak at height n+1.at n=15A005557
• Denominator of mass (Sum 1/|Aut(H)|) of Hadamard matrices of order 4n.at n=5A048616
• Fixed points of the following function: if n = Product p(i)^r(i) then f(n) = Product (-2+p(i)^(r(i)-1)+p(i)^r(i)).at n=3A055128
• Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 4 ones in any 5 X 5 X 5 subtriangle.at n=16A153937
• Number of days after Jan 01 1000 such that the date written in the format DDMMYYYY is palindromic.at n=34A210885
• Number A(n,k) of standard Young tableaux of shape [n*k,n]; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=50A214776
• a(n) = binomial(5*n,n)*(3*n+1)/(4*n+1).at n=5A215541
• Number of standard Young tableaux of shape [5n,5].at n=4A215545
• Steffensen's bracket function [n,n-3].at n=21A241170
• Triangle, read by rows, T(n,k) = 2*k*C(2*(n+k),n-k)/(n+k).at n=39A257501
• a(1) = 1; thereafter a(n) is the product of all 0 < m < n for which n == a(m) (mod m).at n=50A271530
• Let f_k(n) be the result of applying phi (the Euler totient function A000010) k times to n; a(n) = n*Product_{k=1..oo} f_k(n).at n=22A291782
• Completely multiplicative with a(p) = p * a(p-1) for any prime number p.at n=45A309243
• Number of integer compositions of n whose leaders of maximal anti-runs are not identical.at n=17A374640