Partial sums of the binomial coefficients binomial(3*n,n) (A005809).

A188675

Partial sums of the binomial coefficients binomial(3*n,n) (A005809).

Terms

    a(0) =1a(1) =4a(2) =19a(3) =103a(4) =598a(5) =3601a(6) =22165a(7) =138445a(8) =873916a(9) =5560741a(10) =35605756a(11) =229142476a(12) =1480820176a(13) =9603245620a(14) =62463474700a(15) =407330900284

External references