a(n) = (Product_{i=1..n} i^i) / denominator( Sum_{j=1..n} j*(j+1)/2 / (Product_{k=0..j-1} j!/k!) ).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =5a(6) =3a(7) =7a(8) =4a(9) =9a(10) =5a(11) =11a(12) =6a(13) =143a(14) =7a(15) =15a(16) =104a(17) =935a(18) =9a(19) =19a(20) =10a(21) =21a(22) =11a(23) =4025a(24) =3900a(25) =325a(26) =3289a(27) =27a(28) =14a(29) =29