9680369943domain: NAppears in sequencesDenominators of successive convergents to continued fraction 1+2/(3+3/(4+4/(5+5/(6+6/(7+7/(8+8/(9+9/10+...))))))).at n=11A053519Number of simple relaxed compacted binary trees of right height at most one with no sequences on level 1 and no final sequences on level 0.at n=13A316666