Triangle read by rows: matrix product A000012 * A136717.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =4a(6) =1a(7) =4a(8) =16a(9) =12a(10) =1a(11) =4a(12) =16a(13) =84a(14) =48a(15) =1a(16) =4a(17) =16a(18) =156a(19) =504a(20) =192a(21) =1a(22) =4a(23) =16a(24) =156a(25) =1464a(26) =3312a(27) =960a(28) =1a(29) =4