Binomial coefficient C(5n+10,n).

Terms

a(0) =1a(1) =15a(2) =190a(3) =2300a(4) =27405a(5) =324632a(6) =3838380a(7) =45379620a(8) =536878650a(9) =6358402050a(10) =75394027566a(11) =895068996640