a(n) = floor(M(g(n-1)+1,..,g(n))), where M = harmonic mean and g(n) = n*(n + 1)*(n + 2)*(n + 3)/24.

Terms

a(0) =1a(1) =3a(2) =9a(3) =24a(4) =51a(5) =95a(6) =164a(7) =266a(8) =407a(9) =598a(10) =850a(11) =1174a(12) =1582a(13) =2087a(14) =2706a(15) =3452a(16) =4342a(17) =5395a(18) =6628a(19) =8060a(20) =9714a(21) =11609a(22) =13768a(23) =16215a(24) =18975a(25) =22072a(26) =25534a(27) =29388a(28) =33662a(29) =38387