107474domain: NAppears in sequencesDenominators of continued fraction convergents to sqrt(681).at n=10A042309Expansion of Product_{k>=1} (1 + x^k - x^(3*k)) / (1 - x^k).at n=32A266650Number of 4-cycles in the n-cycle complement and (n+1)-wheel complement graph.at n=31A367985