Denominator of J(n) = A000356(n)/A000309(n) (average number of 4-colorings of rank 0 in a rooted nonseparable map which is trivalent and has 2n nodes).
A097875
Denominator of J(n) = A000356(n)/A000309(n) (average number of 4-colorings of rank 0 in a rooted nonseparable map which is trivalent and has 2n nodes).
Terms
- a(0) =1a(1) =4a(2) =24a(3) =88a(4) =52a(5) =2176a(6) =41344a(7) =55936a(8) =22080a(9) =2561280a(10) =27617280a(11) =16570368a(12) =34061312a(13) =1540980736a(14) =23512383488a(15) =100462002176a(16) =50231001088
External references
- oeis: A097875