Triangle read by rows: (1/5) * (A007318^4 - A007318^(-1)) as infinite lower triangular matrices.

Terms

a(0) =1a(1) =3a(2) =2a(3) =13a(4) =9a(5) =3a(6) =51a(7) =52a(8) =18a(9) =4a(10) =205a(11) =255a(12) =130a(13) =30a(14) =5a(15) =819a(16) =1230a(17) =765a(18) =260a(19) =45a(20) =6a(21) =3277a(22) =5733a(23) =4305a(24) =1785a(25) =455a(26) =63a(27) =7a(28) =13107a(29) =26216