# A101901 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 30 5 110 6 484 7 2514 8 15142 9 104126 10 806772 11 6965090 12 66374766 13 692629618 14 7860173564 15 96428710490 16 1272217776422 17 17968286438066 18 270569090589308 19 4328163151246858 20 73311692500174358 21 1311041890981700358