Triangle read by rows: T[n,m] = quadruple factorials A001813(n) * binomials A007318(n,m).

Terms

a(0) =1a(1) =2a(2) =2a(3) =12a(4) =24a(5) =12a(6) =120a(7) =360a(8) =360a(9) =120a(10) =1680a(11) =6720a(12) =10080a(13) =6720a(14) =1680a(15) =30240a(16) =151200a(17) =302400a(18) =302400a(19) =151200a(20) =30240a(21) =665280a(22) =3991680a(23) =9979200a(24) =13305600a(25) =9979200a(26) =3991680a(27) =665280a(28) =17297280a(29) =121080960