# A006907 (b-file synthesized from sequence entry) 1 0 2 0 3 1 4 4 5 10 6 29 7 55 8 153 9 307 10 588 11 1018 12 2230 13 3543 14 6878 15 11216 16 20615 17 33355 18 57980 19 90194 20 155176 21 239327 22 395473 23 604113 24 970294 25 1453749 26 2323476 27 3425849 28 5349414 29 7905133 30 11963861 31 17521274 32 26472001 33 38054619 34 56756488 35 81683457 36 119005220 37 170498286 38 247619748