Number of regions among all distinct circles that can be constructed from a 2 X n square grid of points using only a compass.

A359860

Number of regions among all distinct circles that can be constructed from a 2 X n square grid of points using only a compass.

Terms

    a(0) =3a(1) =45a(2) =231a(3) =865a(4) =2081a(5) =4489a(6) =8211a(7) =14401a(8) =22857a(9) =35445a(10) =51741a(11) =74397a(12) =102271a(13) =138801a(14) =182739a(15) =238181a(16) =303175a(17) =383097a(18) =474995a(19) =586021a(20) =712003a(21) =860829a(22) =1028225a(23) =1223773a(24) =1440593a(25) =1689993a(26) =1965525a(27) =2279509a(28) =2622993a(29) =3011405

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