20545

Appears in sequences

• Coordination sequence for sigma-CrFe, Position Xb.at n=36A009960
• Numbers whose base-4 representation contains exactly four 0's and four 1's.at n=23A045037
• a(1) = 1, a(n) = Sum_{k=1..n} a(n-1) + k.at n=6A103519
• Number of strings of numbers x(i=1..5) in 0..n with sum i*x(i) equal to n*5.at n=19A184705
• Expansion of 1 / ((1-x)^2*(1-x^2)*(1-x^3)*...*(1-x^10)).at n=30A288345
• Sum of the squarefree parts of the partitions of n into 9 parts.at n=32A309485
• Irregular triangular array, read by rows: T(n,k) is the sum of the products of multinomial coefficients (n_1 + n_2 + n_3 + ...)!/(n_1! * n_2! * n_3! * ...) taken k at a time, where (n_1, n_2, n_3, ...) runs over all integer partitions of n (n >= 0, 0 <= k <= A000041(n)).at n=19A309951
• Irregular triangular array, read by rows: T(n,k) is the sum of the products of distinct multinomial coefficients (n_1 + n_2 + n_3 + ...)!/(n_1! * n_2! * n_3! * ...) taken k at a time, where (n_1, n_2, n_3, ...) runs over all integer partitions of n (n >= 0, 0 <= k <= A070289(n)).at n=19A325305
• Number of integer partitions of n that are empty, or have smallest part dividing all the others, but do not have greatest part divisible by all the others.at n=38A343345