Triangle, read by rows, equal to R^4, the matrix 4th power of R = A135894.

Terms

a(0) =1a(1) =4a(2) =1a(3) =26a(4) =12a(5) =1a(6) =216a(7) =138a(8) =20a(9) =1a(10) =2171a(11) =1716a(12) =330a(13) =28a(14) =1a(15) =25628a(16) =23647a(17) =5440a(18) =602a(19) =36a(20) =1a(21) =348050a(22) =362116a(23) =94515a(24) =12348a(25) =954a(26) =44a(27) =1a(28) =5352788a(29) =6138746