Denominators of a-sequence for Sheffer matrix A130191 (Stirling2 squared).

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =15a(5) =3a(6) =84a(7) =3a(8) =5a(9) =20a(10) =33a(11) =6a(12) =5460a(13) =210a(14) =12a(15) =48a(16) =255a(17) =45a(18) =1596a(19) =105a(20) =2310a(21) =1320a(22) =138a(23) =36a(24) =9100a(25) =546a(26) =756a(27) =112a(28) =435a(29) =30