241837domain: NAppears in sequencesNumerator of Sum_{k=1..n} (-1)^(k+1)/k^5.at n=3A136676Number of ways to tile a 2 X n grid with dominoes and L-trominoes such that no four tiles meet at a corner.at n=17A329185a(n) = Sum_{k=1..n} (-1)^(k+1) * floor(n/k)^5.at n=11A344723