# A002058 (b-file synthesized from sequence entry) 5 2 6 14 7 72 8 330 9 1430 10 6006 11 24752 12 100776 13 406980 14 1634380 15 6537520 16 26075790 17 103791870 18 412506150 19 1637618400 20 6495886320 21 25751549340 22 102042235620 23 404225281200 24 1600944863700 25 6339741660252 26 25103519174844 27 99399793096352