# A006814 (b-file synthesized from sequence entry) 1 1 2 6 3 21 4 76 5 249 6 814 7 2521 8 7824 9 23473 10 70590 11 207345 12 610356 13 1765959 14 511006 15 14643993 16 41958852 17 118976633 18 337823486 19 951157365 20 2681163492 21 7505218171 22 21030311474