# A047761 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 3 4 5 5 12 6 23 7 55 8 114 9 273 10 588 11 1428 12 3156 13 7752 14 17427 15 43263 16 98516 17 246675 18 567281 19 1430715 20 3316521 21 8414640 22 19633796 23 50067108 24 117464424 25 300830572 26 709098696 27 1822766520 28 4313876888 29 11124755664 30 26421284043