5892561675domain: NAppears in sequencesExpansion of e.g.f. theta_3^(3/2).at n=13A015665Number of near-matchings on the complete graph over 2n+1 vertices.at n=8A200142a(n) = binomial(n+1,2)*n!/n!!.at n=17A293656Number of minimum edge covers of the complete graph K_n.at n=18A351990