Binomial coefficient C(19,n).

Terms

a(0) =1a(1) =19a(2) =171a(3) =969a(4) =3876a(5) =11628a(6) =27132a(7) =50388a(8) =75582a(9) =92378a(10) =92378a(11) =75582a(12) =50388a(13) =27132a(14) =11628a(15) =3876a(16) =969a(17) =171a(18) =19a(19) =1