a(n) = lcm(n,n+1,n+2,n+3,n+4,n+5,n+6)/420.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =6a(5) =66a(6) =66a(7) =858a(8) =858a(9) =429a(10) =572a(11) =9724a(12) =2652a(13) =50388a(14) =3876a(15) =3876a(16) =42636a(17) =245157a(18) =28842a(19) =48070a(20) =32890a(21) =296010a(22) =296010a(23) =780390a(24) =33930a(25) =525915a(26) =841464a(27) =712008a(28) =1344904a(29) =1344904