24640

Appears in sequences

• a(n) is least k such that k and 7k are anagrams in base n (written in base 10).at n=13A023099
• a(n) = 3rd elementary symmetric function of the first n+2 odd positive integers.at n=5A024197
• Triangle of coefficients in expansion of (x+1)*(x+3)*...*(x + 2n - 1) in rising powers of x.at n=41A028338
• A convolution triangle of numbers obtained from A034255.at n=24A048882
• a(n) is the sum of all integers from 2^(n-2)+1 to 2^(n-1).at n=7A049775
• Triangle of coefficients of polynomials enumerating trees with n labeled nodes by inversions.at n=49A052121
• Expansion of (1-2x)/(1-2x-2x^2+2x^3).at n=13A052970
• Jacobi form of weight 12 and index 1 for the Niemeier lattice of type D_24.at n=7A055749
• Number of periodic palindromic structures of length n using a maximum of two different symbols.at n=29A056503
• Table read by descending antidiagonals where T(n,k) = T(n,k-1) + T(n,k-1)^2/k^2 and T(n,0)=n.at n=38A061314
• a(n) = a(n-1) * (1 + a(n-1)/n^2) with a(0) = 2.at n=6A061322
• Numbers k such that sigma(prime(k) + 1) == 0 (mod k).at n=42A067759
• Number of 5-gonal compositions of n into positive parts.at n=32A069983
• a(n) = n*(n+2)*(n-2)/3.at n=40A077415
• Number of ways to change three non-identical letters in the word aabbccdd..., where there are n types of letters.at n=20A102860
• Triangle of coefficients in expansion of (1+x)*(1+3x)*(1+5x)*(1+7x)*...*(1+(2n-1)x).at n=39A109692
• Expansion of x*(1+5*x)/((1+2*x+1)*(1-4*x)).at n=8A117110
• A Moessner triangle using (1, 3, 5, ...).at n=23A125750
• Partition number array, called M32hat(-2)= 'M32(-2)/M3'= 'A143172/A036040', related to A004747(n,m)= |S2(-2;n,m)| (generalized Stirling triangle).at n=46A144274
• a(n) = A061039(8*n+5).at n=19A144453