Triangle T(n,k) read by rows, arising in enumeration of catafusenes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =5a(8) =7a(9) =3a(10) =1a(11) =8a(12) =22a(13) =24a(14) =9a(15) =1a(16) =11a(17) =46a(18) =90a(19) =81a(20) =27a(21) =1a(22) =14a(23) =79a(24) =228a(25) =351a(26) =270a(27) =81a(28) =1a(29) =17