A363586 a(n) is the number of mappings X:{{1..n} choose 3}->{+,-} such that X(a,b,c) = X(b,c,d) implies X(a,b,c) = X(a,b,d) = X(a,c,d) = X(b,c,d) for a < b < c < d.
2, 10, 120, 3284, 199724, 26680618, 7782067930, 4936744315756
Offset: 3
Links
- M. Balko, Ramsey numbers and monotone colorings, Journal of Combinatorial Theory, Series A, Volume 163 (2019), 34-58.
Extensions
a(9)-a(10) from Bert Dobbelaere, Jun 26 2023