Number of nonterminal symbols in a certain "divide-and-conquer" context-free grammar in Chomsky normal form that generates all permutations of n symbols.
A092284
Number of nonterminal symbols in a certain "divide-and-conquer" context-free grammar in Chomsky normal form that generates all permutations of n symbols.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =11a(4) =26a(5) =42a(6) =99a(7) =107a(8) =382a(9) =428a(10) =1156a(11) =1223a(12) =4525a(13) =4903a(14) =14811a(15) =14827a(16) =58022a(17) =61236a(18) =201420a(19) =201611
External references
- oeis: A092284