Binomial coefficients C(2*n+9,9).

Terms

a(0) =1a(1) =55a(2) =715a(3) =5005a(4) =24310a(5) =92378a(6) =293930a(7) =817190a(8) =2042975a(9) =4686825a(10) =10015005a(11) =20160075a(12) =38567100a(13) =70607460a(14) =124403620a(15) =211915132a(16) =350343565a(17) =563921995a(18) =886163135a(19) =1362649145a(20) =2054455634a(21) =3042312350a(22) =4431613550a(23) =6358402050a(24) =8996462475a(25) =12565671261a(26) =17341763505