Sequence a(n) = (1 + A007805(n))/2, appearing in a certain touching problem for three circles and a chord, together with A007805.

A246641

Sequence a(n) = (1 + A007805(n))/2, appearing in a certain touching problem for three circles and a chord, together with A007805.

Terms

    a(0) =1a(1) =9a(2) =153a(3) =2737a(4) =49105a(5) =881145a(6) =15811497a(7) =283725793a(8) =5091252769a(9) =91358824041

External references