# A218540 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 5 4 10 5 66 6 154 7 1122 8 2805 9 21505 10 55913 11 442221 12 1179256 13 9524760 14 25852920 15 211993944 16 582983346 17 4835332458 18 13431479050 19 112400272050 20 314720761740 21 2652646420380 22 7475639911980 23 63380425340700 24 179577871798650 25 1530003467724498