41607domain: NAppears in sequencesa(n) = (8*n+1)*(8*n+7).at n=25A001533Number of 2-diregular digraphs with n nodes.at n=7A00564124-hedral numbers: a(n) = (2*n + 1)*(8*n^2 + 14*n + 7).at n=13A254473