a(n) = 7*(n+1)*binomial(n+5,7).

Terms

a(0) =21a(1) =224a(2) =1260a(3) =5040a(4) =16170a(5) =44352a(6) =108108a(7) =240240a(8) =495495a(9) =960960a(10) =1769768a(11) =3118752a(12) =5290740a(13) =8682240a(14) =13837320a(15) =21488544a(16) =32605881a(17) =48454560a(18) =70662900a(19) =101301200a(20) =142972830a(21) =198918720a(22) =273136500a(23) =370515600a(24) =496989675a(25) =659707776a(26) =867225744a(27) =1129719360a(28) =1459220840