Triangle read by rows: coefficients of second-order hypergeometric-harmonic polynomials.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =5a(6) =0a(7) =1a(8) =15a(9) =26a(10) =0a(11) =1a(12) =35a(13) =156a(14) =154a(15) =0a(16) =1a(17) =75a(18) =650a(19) =1540a(20) =1044a(21) =0a(22) =1a(23) =155a(24) =2340a(25) =10010a(26) =15660a(27) =8028a(28) =0a(29) =1