Triangle of D'Arcais numbers.

Terms

a(0) =1a(1) =3a(2) =1a(3) =8a(4) =9a(5) =1a(6) =42a(7) =59a(8) =18a(9) =1a(10) =144a(11) =450a(12) =215a(13) =30a(14) =1a(15) =1440a(16) =3394a(17) =2475a(18) =565a(19) =45a(20) =1a(21) =5760a(22) =30912a(23) =28294a(24) =9345a(25) =1225a(26) =63a(27) =1a(28) =75600a(29) =293292