# A022874 (b-file synthesized from sequence entry) 1 2 2 1 3 1 4 2 5 6 6 19 7 60 8 194 9 628 10 2035 11 6597 12 21393 13 69382 14 225031 15 729865 16 2367255 17 7678002 18 24902998 19 80770936 20 261974262 21 849693202 22 2755914018 23 8938593456 24 28991634898 25 94032120191 26 304985891949 27 989198096368