# A132840 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 11 4 44 5 184 6 800 7 3544 8 15950 9 72666 10 334276 11 1549876 12 7232910 13 33939590 14 160002964 15 757355152 16 3597467523 17 17140996739 18 81896369733 19 392242556233 20 1882772831063 21 9055276934011 22 43630125033845 23 210563441647421