# A163137 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 13 5 39 6 113 7 359 8 1161 9 3708 10 11961 11 38903 12 126885 13 415509 14 1365935 15 4501009 16 14856863 17 49115474 18 162590020 19 538828790 20 1787431873 21 5934532485 22 19718347615 23 65559507987 24 218095336290 25 725890070743 26 2417022095921