Triangle read by rows: square of the lower triangular mean matrix.

Terms

a(0) =1a(1) =3a(2) =1a(3) =11a(4) =5a(5) =2a(6) =25a(7) =13a(8) =7a(9) =3a(10) =137a(11) =77a(12) =47a(13) =27a(14) =12a(15) =147a(16) =87a(17) =57a(18) =37a(19) =22a(20) =10a(21) =1089a(22) =669a(23) =459a(24) =319a(25) =214a(26) =130a(27) =60a(28) =2283a(29) =1443