Maximum over 0 <= k <= n/2 of the number of permutations of two symbols occurring k and n-2*k times, respectively, where a permutation and its reversal are counted only once.
A362260
Maximum over 0 <= k <= n/2 of the number of permutations of two symbols occurring k and n-2*k times, respectively, where a permutation and its reversal are counted only once.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =6a(8) =9a(9) =12a(10) =19a(11) =28a(12) =44a(13) =66a(14) =110a(15) =170a(16) =255a(17) =396a(18) =651a(19) =1001a(20) =1519a(21) =2520a(22) =4032a(23) =6216a(24) =9752a(25) =15912a(26) =25236a(27) =38760a(28) =63090a(29) =101850
External references
- oeis: A362260