# A126380 (b-file synthesized from sequence entry) 0 1 1 26 2 76 3 224 4 662 5 1960 6 5810 7 17238 8 51180 9 152040 10 451874 11 1343530 12 3995984 13 11888510 14 35378800 15 105307232 16 313517862 17 933569352 18 2780376498 19 8281841754 20 24672375600 21 73510750578 22 219049521636 23 652802078652 24 1945651872306