16777189domain: NAppears in sequencesa(n) = Sum_{k=0..n} (1-(-1)^( floor( (-n-k)/2^k ) )) * 2^(k-1).at n=23A105229Numbers of the form Abs[m^m - n^n], where integers m,n>0.at n=26A124076a(n) = 2^n - 27.at n=24A220087Number of irreducible permutations of n with partition type [2, 1, 1, ..., 1] (with '1' taken n - 2 times).at n=24A356114