Central coefficients of q in the q-analog of the even double factorials: a(n) = [q^([n^2/2])] Product_{j=1..n} (1-q^(2j))/(1-q).
A128085
Central coefficients of q in the q-analog of the even double factorials: a(n) = [q^([n^2/2])] Product_{j=1..n} (1-q^(2j))/(1-q).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =46a(5) =340a(6) =3210a(7) =36336a(8) =484636a(9) =7394458a(10) =127707302a(11) =2454109404a(12) =52091631896
External references
- oeis: A128085