190104domain: NAppears in sequencesa(n) = A014486(A080068(n)).at n=9A080069Number of n X 4 0..3 arrays with no element equal to another at a city block distance of exactly two, and new values 0..3 introduced in row major order.at n=9A222834Expansion of (eta(q^5) * eta(q^10) / (eta(q) * eta(q^2)))^2 in powers of q.at n=21A227213