First differences of A016759.

Terms

a(0) =2186a(1) =75938a(2) =745418a(3) =3959426a(4) =14704202a(5) =43261346a(6) =108110858a(7) =239479298a(8) =483533066a(9) =907216802a(10) =1603736906a(11) =2698690178a(12) =4356837578a(13) =6789523106a(14) =10262737802a(15) =15105828866a(16) =21720853898a(17) =30592580258a(18) =42299129546a(19) =57523267202a(20) =77064337226a(21) =101850842018