Sequence a(n) = 1 + A001519(n+1) appearing in a certain touching problem for three circles and a chord, together with A246638.

A246640

Sequence a(n) = 1 + A001519(n+1) appearing in a certain touching problem for three circles and a chord, together with A246638.

Terms

    a(0) =2a(1) =3a(2) =6a(3) =14a(4) =35a(5) =90a(6) =234a(7) =611a(8) =1598a(9) =4182a(10) =10947a(11) =28658a(12) =75026a(13) =196419a(14) =514230a(15) =1346270a(16) =3524579a(17) =9227466a(18) =24157818a(19) =63245987a(20) =165580142a(21) =433494438a(22) =1134903171a(23) =2971215074a(24) =7778742050a(25) =20365011075a(26) =53316291174a(27) =139583862446a(28) =365435296163a(29) =956722026042

External references