# A126898 (b-file synthesized from sequence entry) 0 1 1 15 2 120 3 675 4 2940 5 10425 6 31320 7 82365 8 194520 9 420795 10 846600 11 1602975 12 2883060 13 4962165 14 8221800 15 13178025 16 20514480 17 31120455 18 46134360 19 66992955 20 95486700 21 133821585 22 184687800 23 251335605 24 337658760 25 448285875 26 588680040 27 765247095