Column 3 of triangle A128545; a(n) is the coefficient of q^(3n+9) in the central q-binomial coefficient [2n+6,n+3].
A128553
Column 3 of triangle A128545; a(n) is the coefficient of q^(3n+9) in the central q-binomial coefficient [2n+6,n+3].
Terms
- a(0) =1a(1) =5a(2) =18a(3) =58a(4) =155a(5) =383a(6) =867a(7) =1860a(8) =3782a(9) =7409a(10) =13989a(11) =25683a(12) =45905a(13) =80262a(14) =137453a(15) =231269a(16) =382689a(17) =624061a(18) =1003787a(19) =1594796a(20) =2504587a(21) =3892100a(22) =5988403a(23) =9129707a(24) =13798792a(25) =20688367a(26) =30781988a(27) =45473815a(28) =66723042a(29) =97276842
External references
- oeis: A128553