Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Sum_{j>=1} sigma_k(j) * x^j).

A294296

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Sum_{j>=1} sigma_k(j) * x^j).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =1a(7) =1a(8) =7a(9) =25a(10) =1a(11) =1a(12) =11a(13) =43a(14) =193a(15) =1a(16) =1a(17) =19a(18) =91a(19) =409a(20) =1481a(21) =1a(22) =1a(23) =35a(24) =223a(25) =1105a(26) =3841a(27) =16021a(28) =1a(29) =1

External references