Irregular triangle read by rows where T(n,k) is the number of set partitions of {1,...,n} with all block-sums equal to d, where d is the k-th divisor of n*(n+1)/2 that is >= n.

A320438

Irregular triangle read by rows where T(n,k) is the number of set partitions of {1,...,n} with all block-sums equal to d, where d is the k-th divisor of n*(n+1)/2 that is >= n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =4a(12) =1a(13) =1a(14) =3a(15) =7a(16) =1a(17) =1a(18) =9a(19) =1a(20) =1a(21) =1a(22) =1a(23) =43a(24) =35a(25) =1a(26) =1a(27) =102a(28) =62a(29) =1

External references