Column 2 of triangle A128596; a(n) = coefficient of q^(2n+4) in the q-analog of the even double factorials (2n+4)!! for n>=0.
A128597
Column 2 of triangle A128596; a(n) = coefficient of q^(2n+4) in the q-analog of the even double factorials (2n+4)!! for n>=0.
Terms
- a(0) =1a(1) =7a(2) =46a(3) =297a(4) =1919a(5) =12399a(6) =80241a(7) =520399a(8) =3382588a(9) =22034519a(10) =143826980a(11) =940569228a(12) =6161492611a(13) =40426009162a(14) =265617089899
External references
- oeis: A128597