Matrix square of triangle A121412.

Terms

a(0) =1a(1) =2a(2) =1a(3) =7a(4) =2a(5) =1a(6) =43a(7) =9a(8) =2a(9) =1a(10) =403a(11) =69a(12) =11a(13) =2a(14) =1a(15) =5188a(16) =769a(17) =101a(18) =13a(19) =2a(20) =1a(21) =85569a(22) =11346a(23) =1305a(24) =139a(25) =15a(26) =2a(27) =1a(28) =1725291a(29) =208914