Triangle of the denominators of the coefficients [x^k] P(n,x) defined in A141904.

Terms

a(0) =1a(1) =3a(2) =1a(3) =5a(4) =3a(5) =1a(6) =7a(7) =45a(8) =1a(9) =1a(10) =9a(11) =105a(12) =15a(13) =3a(14) =1a(15) =11a(16) =1575a(17) =945a(18) =15a(19) =3a(20) =1a(21) =13a(22) =10395a(23) =175a(24) =945a(25) =9a(26) =1a(27) =1a(28) =15a(29) =315315