Triangle read by rows: T(n,k) is the number of polygons with 2*n sides, of which k run through the center of a circle, on the circumference of which the 2*n vertices of the polygon are arranged at equal spacing, up to rotation and reflection.

A358329

Triangle read by rows: T(n,k) is the number of polygons with 2*n sides, of which k run through the center of a circle, on the circumference of which the 2*n vertices of the polygon are arranged at equal spacing, up to rotation and reflection.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =4a(7) =3a(8) =3a(9) =2a(10) =70a(11) =60a(12) =54a(13) =12a(14) =6a(15) =2980a(16) =3512a(17) =2088a(18) =704a(19) =156a(20) =28a(21) =268444a(22) =315840a(23) =176928a(24) =59204a(25) =13488a(26) =1920a(27) =193a(28) =36387789a(29) =42112416

External references