Triangle, read by rows, equal to the matrix cube of triangle P = A135880.

Terms

a(0) =1a(1) =3a(2) =1a(3) =12a(4) =6a(5) =1a(6) =63a(7) =39a(8) =9a(9) =1a(10) =421a(11) =300a(12) =81a(13) =12a(14) =1a(15) =3472a(16) =2741a(17) =816a(18) =138a(19) =15a(20) =1a(21) =34380a(22) =29380a(23) =9366a(24) =1716a(25) =210a(26) =18a(27) =1a(28) =399463a(29) =363922