181542domain: NAppears in sequencesHigh-temperature series in w = tanh(J/kT) for ferromagnetic susceptibility for the spin-1/2 Ising model on hexagonal lattice.at n=8A002920Number of (n+4) X 11 0..1 matrices with each 5 X 5 subblock idempotent.at n=21A224689Fixed points of A300956.at n=29A300958