a(n) = binomial coefficient C(n,14).

Terms

a(0) =1a(1) =15a(2) =120a(3) =680a(4) =3060a(5) =11628a(6) =38760a(7) =116280a(8) =319770a(9) =817190a(10) =1961256a(11) =4457400a(12) =9657700a(13) =20058300a(14) =40116600a(15) =77558760a(16) =145422675a(17) =265182525a(18) =471435600a(19) =818809200a(20) =1391975640a(21) =2319959400a(22) =3796297200a(23) =6107086800a(24) =9669554100a(25) =15084504396a(26) =23206929840a(27) =35240152720