# A056341 (b-file synthesized from sequence entry) 1 6 2 21 3 56 4 231 5 888 6 4291 7 20646 8 107331 9 563786 10 3037314 11 16514106 12 90782986 13 502474356 14 2799220041 15 15673673176 16 88162676511 17 497847963696 18 2821127825971 19 16035812864946 20 91404068329560