a(n) = number |fdw(P,(n))| of entangled P-words with s=2.
A211309
a(n) = number |fdw(P,(n))| of entangled P-words with s=2.
Terms
- a(0) =1a(1) =4a(2) =60a(3) =1776a(4) =84720a(5) =5876640a(6) =556466400a(7) =68882446080
External references
- oeis: A211309