Partial sums of A066570.

Terms

a(0) =1a(1) =3a(2) =6a(3) =14a(4) =19a(5) =163a(6) =170a(7) =554a(8) =716a(9) =19916a(10) =19927a(11) =1264087a(12) =1264100a(13) =5779940a(14) =7237940a(15) =17559860a(16) =17559877a(17) =75264356677a(18) =75264356696a(19) =353956196696a(20) =355036399736