1827840

Appears in sequences

• Number of white corners in all permutations of {1,2,...,n} (for definition see the Eriksson-Linusson references).at n=8A140712
• a(1) = 16, a(n) = sigma(a(n-1)).at n=15A257349
• a(n) is the least k such that A188999(A188999(k)) = n*k, where A188999 is the bi-unitary sigma function, or 0 if no such k exists.at n=14A318242
• a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^(n-k) * binomial(2*n-4*k+2,2*k+1).at n=11A387603