# A349847 (b-file synthesized from sequence entry) 0 1 1 10 2 22 3 68 4 230 5 812 6 2940 7 10824 8 40326 9 151580 10 573716 11 2183480 12 8347612 13 32033848 14 123321400 15 476050320 16 1842020550 17 7142249340 18 27743985060 19 107946346200 20 420608639220 21 1641030105000 22 6410161959240 23 25066222437360 24 98115049503900 25 384391435902552