# A148791 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 25 5 77 6 257 7 865 8 3021 9 10549 10 37753 11 135438 12 494280 13 1806200 14 6678951 15 24716159 16 92336889 17 345207465 18 1299979995 19 4897841100 20 18561069686 21 70366144206 22 268059657293 23 1021470014124 24 3908025765480 25 14955232173032 26 57425244146832 27 220542549019640 28 849474612586124 29 3272448053938140