# A150034 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 17 4 57 5 189 6 668 7 2344 8 8533 9 30974 10 114791 11 425083 12 1595222 13 5987456 14 22670866 15 85903427 16 327487069 17 1249648855 18 4789354971 19 18374473131 20 70722563222 21 272488738875 22 1052474921232 23 4069154654592 24 15762913929933 25 61118213094098 26 237343892291713 27 922479508068593 28 3589932929804338