Sequence a(n) = 3 + 5*A001519(n+1) appearing in a certain three circle touching problem, together with A246638.

A246639

Sequence a(n) = 3 + 5*A001519(n+1) appearing in a certain three circle touching problem, together with A246638.

Terms

    a(0) =8a(1) =13a(2) =28a(3) =68a(4) =173a(5) =448a(6) =1168a(7) =3053a(8) =7988a(9) =20908a(10) =54733a(11) =143288a(12) =375128a(13) =982093a(14) =2571148a(15) =6731348a(16) =17622893a(17) =46137328a(18) =120789088a(19) =316229933a(20) =827900708a(21) =2167472188a(22) =5674515853a(23) =14856075368a(24) =38893710248a(25) =101825055373a(26) =266581455868a(27) =697919312228

External references