Lower triangular array called S1hat(5) related to partition number array A144890.

Terms

a(0) =1a(1) =5a(2) =1a(3) =30a(4) =5a(5) =1a(6) =210a(7) =55a(8) =5a(9) =1a(10) =1680a(11) =360a(12) =55a(13) =5a(14) =1a(15) =15120a(16) =3630a(17) =485a(18) =55a(19) =5a(20) =1a(21) =151200a(22) =29820a(23) =4380a(24) =485a(25) =55a(26) =5a(27) =1a(28) =1663200a(29) =321300