210840

Appears in sequences

• Expansion of 1/((1-3x)(1-4x)(1-6x)(1-7x)).at n=5A028032
• T(n,k) is the number of size k ordered submultisets of the regular multiset {1_1,1_2,...,1_(n-1),1_n, ... ,i_1,i_2,...,i_(n-1),i_n, ... ,n_1,n_2,...,n_(n-1),n_n} (which contains n copies of i for 1 <= i <= n).at n=27A234574
• Nonprime numbers k that divide the sum of remainders of k' mod m, for m from 1 to k', where k' is the arithmetic derivative of k.at n=9A248135
• Triangle read by rows: T(m,n) = number of ways of distributing n distinguishable balls into m distinguishable bins of size 4 where empty bins are permitted (m >= 1, 1 <= n <= 4m).at n=32A248846
• a(n) = Sum_{k=0..n} 3^(n-k) * binomial(n+3,k+3) * binomial(2*k+6,k+6).at n=5A387276