Denominators in a harmonic triangle; q-analog of A126615, here q = 2.

Terms

a(0) =1a(1) =3a(2) =3a(3) =3a(4) =21a(5) =7a(6) =3a(7) =21a(8) =105a(9) =15a(10) =3a(11) =21a(12) =105a(13) =465a(14) =31a(15) =3a(16) =21a(17) =105a(18) =465a(19) =1953a(20) =63a(21) =3a(22) =21a(23) =105a(24) =465a(25) =1953a(26) =8001a(27) =127a(28) =3a(29) =21