22080

Appears in sequences

• Series for second perpendicular moment of square lattice.at n=13A006734
• Number of labeled groups.at n=7A034383
• Number of positive integers <= 2^n of form x^2 + 7 y^2.at n=17A054151
• Triangle read by rows: T(n,k) is the number of labeled monoids of order n with k idempotents.at n=28A058157
• a(n) = (n/2)*(n + 1)*(3*n + 11).at n=22A059997
• Denominator of J(n) = A000356(n)/A000309(n) (average number of 4-colorings of rank 0 in a rooted nonseparable map which is trivalent and has 2n nodes).at n=8A097875
• n times the n-th n-gonal number.at n=15A117665
• Number of Lyndon words on {1, 2, 3} with an even number of 1's.at n=11A133267
• Numbers with prime factorization pqrs^6.at n=7A190292
• Sum of all parts of all overpartitions of n.at n=14A235793
• Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0.at n=4A256740
• Number of (n+2)X(5+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0.at n=4A256745
• Number of elements of S_n with strategic pile of size 4.at n=8A267324
• Triangle that arise in the study of Galois polynomials.at n=9A268482
• Triangle of generalized Stirling numbers of the second kind S(n,k) associated with the generalized Bell numbers A271049(n); S(n,k) = Sum_{j=0..k} (-1)^(k-j)*binomial(k,j)*Gamma((j+2)/3)*Gamma(3*n+j-1)/(Gamma(j)*Gamma(n+(j-1)/3))/(3^(n-1)*k!).at n=17A271204
• Irregular triangle read by rows: numbers (2n-1)!*G(n,m) related to Galois polynomials.at n=12A280040
• a(n) = phi(A291789(n)).at n=19A291805
• a(n) = phi(n^3 - 1)/3 where phi is A000010.at n=40A319213
• a(1) = 1; thereafter a(n) = a(n-1) / phi(n) if phi(n) divides a(n-1), otherwise a(n) = a(n-1) * phi(n), where phi is the Euler phi-function A000010.at n=47A326889
• Heinz numbers of integer partitions such that 3*(sum) = (reverse-weighted sum).at n=40A363531