# A121299 (b-file synthesized from sequence entry) 1 1 2 4 3 14 4 47 5 149 6 458 7 1373 8 4046 9 11765 10 33857 11 96611 12 273760 13 771164 14 2161352 15 6031104 16 16764719 17 46442640 18 128268379 19 353296944 20 970717966 21 2661204271 22 7280832780 23 19882745230 24 54203791062 25 147536291969 26 400991600305