Main diagonal of Inverse Stolarsky array.

Terms

a(0) =1a(1) =7a(2) =25a(3) =101a(4) =321a(5) =1075a(6) =3426a(7) =9958a(8) =30253a(9) =92735a(10) =253731a(11) =739303a(12) =2056915a(13) =5899304a(14) =17108660a(15) =46137324a(16) =130016549a(17) =370248450a(18) =993480845a(19) =2766546762a(20) =7510827752a(21) =20798505510a(22) =58123818148a(23) =155141346542a(24) =426530329383