Triangle read by rows: T(n,k) is the number of ruler-and-compass constructions consisting of n-k lines and k circles with 0 <= k <= n.
A383273
Triangle read by rows: T(n,k) is the number of ruler-and-compass constructions consisting of n-k lines and k circles with 0 <= k <= n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =0a(4) =2a(5) =1a(6) =0a(7) =0a(8) =12a(9) =4a(10) =0a(11) =0a(12) =45a(13) =116a(14) =44a(15) =0a(16) =0a(17) =232a(18) =1565a(19) =3005a(20) =1084a(21) =0a(22) =0a(23) =1627a(24) =34114a(25) =166556a(26) =249494a(27) =91192a(28) =0a(29) =0
External references
- oeis: A383273