Triangle read by rows: (1/4) * (A007318^3 - A007318^(-1)) as infinite lower triangular matrices.

Terms

a(0) =1a(1) =2a(2) =2a(3) =7a(4) =6a(5) =3a(6) =20a(7) =28a(8) =12a(9) =4a(10) =61a(11) =100a(12) =70a(13) =20a(14) =5a(15) =182a(16) =366a(17) =300a(18) =140a(19) =30a(20) =6a(21) =547a(22) =1274a(23) =1281a(24) =700a(25) =245a(26) =42a(27) =7a(28) =1640a(29) =4376