Matrix square of triangle A104980.

Terms

a(0) =1a(1) =2a(2) =1a(3) =8a(4) =4a(5) =1a(6) =42a(7) =20a(8) =6a(9) =1a(10) =266a(11) =120a(12) =38a(13) =8a(14) =1a(15) =1954a(16) =836a(17) =270a(18) =62a(19) =10a(20) =1a(21) =16270a(22) =6616a(23) =2150a(24) =516a(25) =92a(26) =12a(27) =1a(28) =151218a(29) =58576