A diagonal of the triangle A128084 of coefficients of q in the q-analog of the even double factorials: a(n) = A128084(n,n).
A128086
A diagonal of the triangle A128084 of coefficients of q in the q-analog of the even double factorials: a(n) = A128084(n,n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =24a(5) =86a(6) =315a(7) =1170a(8) =4389a(9) =16588a(10) =63064a(11) =240901a(12) =923858a(13) =3554747a(14) =13716315a(15) =53054703a(16) =205651975a(17) =798645126a(18) =3106669575a(19) =12102626404a(20) =47210910670a(21) =184385864445a(22) =720920510115
External references
- oeis: A128086