Triangle read by rows: T(n,k) = (1/4)*(A007318(n,k) - 6*A008292(n+1,k+1) + 9*A060187(n+1,k+1)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =8a(5) =1a(6) =1a(7) =36a(8) =36a(9) =1a(10) =1a(11) =133a(12) =420a(13) =133a(14) =1a(15) =1a(16) =449a(17) =3334a(18) =3334a(19) =449a(20) =1a(21) =1a(22) =1446a(23) =21939a(24) =49364a(25) =21939a(26) =1446a(27) =1a(28) =1a(29) =4534