Array used for numerators of g.f.s for column sequences of array A078741 ((3,3)-Stirling2).

Terms

a(0) =1a(1) =18a(2) =9a(3) =432a(4) =1a(5) =672a(6) =14400a(7) =243a(8) =47520a(9) =648000a(10) =27a(11) =36396a(12) =3790800a(13) =38102400a(14) =1a(15) =9765a(16) =5115888a(17) =354715200a(18) =2844979200a(19) =1107a(20) =2499552a(21) =757646784a(22) =39182330880a(23) =263363788800a(24) =54a(25) =546453a(26) =592216272a(27) =123294623040