Hosoya triangle of Morgan Voyce type, read by rows.

Terms

a(0) =9a(1) =21a(2) =21a(3) =54a(4) =49a(5) =54a(6) =141a(7) =126a(8) =126a(9) =141a(10) =369a(11) =329a(12) =324a(13) =329a(14) =369a(15) =966a(16) =861a(17) =846a(18) =846a(19) =861a(20) =966a(21) =2529a(22) =2254a(23) =2214a(24) =2209a(25) =2214a(26) =2254a(27) =2529a(28) =6621a(29) =5901