# A071723 (b-file synthesized from sequence entry) 0 1 1 4 2 15 3 54 4 192 5 682 6 2431 7 8710 8 31382 9 113696 10 414086 11 1515516 12 5571750 13 20569590 14 76228095 15 283481670 16 1057628550 17 3957577800 18 14849601090 19 55859886420 20 210622646520 21 795898303668 22 3013646759910 23 11432740177564 24 43448822603452 25 165396657221152