5!(2n-6)!/n!(n-1)! is an integer.

Terms

a(0) =3a(1) =5a(2) =6a(3) =101a(4) =211a(5) =461a(6) =552a(7) =562a(8) =852a(9) =947a(10) =990a(11) =1223a(12) =1432a(13) =1451a(14) =1458a(15) =1506a(16) =1600a(17) =1626a(18) =1892a(19) =2015a(20) =2069a(21) =2147a(22) =2185a(23) =2333a(24) =2480a(25) =2481a(26) =2666a(27) =2994a(28) =3011a(29) =3017