A Jacobsthal number related number triangle.

Terms

a(0) =1a(1) =1a(2) =1a(3) =6a(4) =2a(5) =1a(6) =30a(7) =18a(8) =3a(9) =1a(10) =264a(11) =120a(12) =36a(13) =4a(14) =1a(15) =2520a(16) =1320a(17) =300a(18) =60a(19) =5a(20) =1a(21) =30960a(22) =15120a(23) =3960a(24) =600a(25) =90a(26) =6a(27) =1a(28) =428400a(29) =216720