# A307261 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 13 4 42 5 130 6 397 7 1197 8 3566 9 10517 10 30760 11 89293 12 257397 13 737220 14 2099215 15 5945594 16 16756258 17 47004829 18 131286914 19 365203797 20 1012031772 21 2794446326 22 7690009600 23 21094325177 24 57687762889 25 157306741287 26 427777384499 27 1160250104637 28 3139067594584 29 8472525405830 30 22815639395641