Triangle read by rows: T(n,k) is the number of nonseparable planar maps with r*n edges and a fixed outer face of r*k edges which are invariant under a rotation of 1/r for any r >= 2 (independent of actual value of r).
A091599
Triangle read by rows: T(n,k) is the number of nonseparable planar maps with r*n edges and a fixed outer face of r*k edges which are invariant under a rotation of 1/r for any r >= 2 (independent of actual value of r).
Terms
- a(0) =1a(1) =2a(2) =1a(3) =6a(4) =6a(5) =1a(6) =24a(7) =26a(8) =12a(9) =1a(10) =110a(11) =120a(12) =75a(13) =20a(14) =1a(15) =546a(16) =594a(17) =416a(18) =174a(19) =30a(20) =1a(21) =2856a(22) =3094a(23) =2289a(24) =1176a(25) =350a(26) =42a(27) =1a(28) =15504a(29) =16728
External references
- oeis: A091599