Matrix square of triangle A091613.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =0a(5) =1a(6) =11a(7) =6a(8) =0a(9) =1a(10) =26a(11) =12a(12) =4a(13) =0a(14) =1a(15) =61a(16) =26a(17) =10a(18) =4a(19) =0a(20) =1a(21) =132a(22) =70a(23) =26a(24) =8a(25) =4a(26) =0a(27) =1a(28) =290a(29) =174