E.g.f.: exp(x/(1-7*x)).A321850E.g.f.: exp(x/(1-7*x)).Terms a(0) =1a(1) =1a(2) =15a(3) =337a(4) =10081a(5) =376461a(6) =16849351a(7) =878797165a(8) =52324954977External referencesoeis: A321850