54760833024domain: NAppears in sequencesExpansion of (-1+1/(1-4*x)^4)/(16*x); related to A038846.at n=14A036070a(n) = 2^(n - 2)*(binomial(n,2) + 2).at n=28A104270Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.at n=15A159721