Alfred Moessner's factorial triangle.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =11a(5) =6a(6) =24a(7) =50a(8) =35a(9) =10a(10) =120a(11) =274a(12) =225a(13) =85a(14) =15a(15) =720a(16) =1764a(17) =1624a(18) =735a(19) =175a(20) =21a(21) =5040a(22) =13068a(23) =13132a(24) =6769a(25) =1960a(26) =322a(27) =28a(28) =40320a(29) =109584