Binomial coefficient C(15,n).

Terms

a(0) =1a(1) =15a(2) =105a(3) =455a(4) =1365a(5) =3003a(6) =5005a(7) =6435a(8) =6435a(9) =5005a(10) =3003a(11) =1365a(12) =455a(13) =105a(14) =15a(15) =1