# A015961 (b-file synthesized from sequence entry) 1 1 2 13 3 169 4 1027 5 2197 6 13351 7 28561 8 81133 9 173563 10 371293 11 468481 12 685633 13 1054729 14 2256319 15 2890927 16 4826809 17 6090253 18 6409507 19 8913229 20 13711477 21 29332147 22 37009999 23 37582051 24 54165007 25 62748517 26 79173289 27 83323591 28 115871977 29 178249201 30 228383233