a(n) = denominator(b_n(x)), where b_n(x) are the polynomials defined in A335947.

Terms

a(0) =1a(1) =1a(2) =12a(3) =4a(4) =240a(5) =48a(6) =1344a(7) =192a(8) =3840a(9) =1280a(10) =33792a(11) =3072a(12) =5591040a(13) =430080a(14) =245760a(15) =49152a(16) =16711680a(17) =983040a(18) =522977280a(19) =27525120a(20) =1211105280a(21) =173015040a(22) =1447034880a(23) =62914560a(24) =22900899840a(25) =4580179968a(26) =1409286144a(27) =469762048a(28) =116769423360a(29) =4026531840