Triangular matrix arising in enumeration of catafusenes, read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =3a(6) =1a(7) =7a(8) =15a(9) =9a(10) =1a(11) =10a(12) =36a(13) =54a(14) =27a(15) =1a(16) =13a(17) =66a(18) =162a(19) =189a(20) =81a(21) =1a(22) =16a(23) =105a(24) =360a(25) =675a(26) =648a(27) =243a(28) =1a(29) =19