Matrix square of triangle A107667.

Terms

a(0) =1a(1) =12a(2) =4a(3) =216a(4) =45a(5) =9a(6) =5248a(7) =816a(8) =112a(9) =16a(10) =160675a(11) =20225a(12) =2200a(13) =225a(14) =25a(15) =5931540a(16) =632700a(17) =58176a(18) =4860a(19) =396a(20) =36a(21) =256182290a(22) =23836540a(23) =1920163a(24) =138817a(25) =9408a(26) =637a(27) =49a(28) =12665445248a(29) =1048592640