# A148777 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 23 5 73 6 234 7 776 8 2644 9 9083 10 31798 11 112573 12 401632 13 1447849 14 5250062 15 19159941 16 70348134 17 259380839 18 960905588 19 3573310663 20 13333335695 21 49921215233 22 187424343330 23 705582305317 24 2662797151989 25 10071249093516 26 38173345073744 27 144964048212063 28 551496111035625 29 2101633645352274