# A147726 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 16 5 54 6 232 7 936 8 3880 9 17302 10 81584 11 425550 12 2332858 13 13639774 14 84416970 15 555549406 16 3834425860 17 27937916790