# A049973 (b-file synthesized from sequence entry) 1 1 2 3 3 3 4 10 5 18 6 45 7 83 8 166 9 330 10 825 11 1567 12 3096 13 6165 14 12322 15 24637 16 49274 17 98546 18 246365 19 468093 20 923871 21 1841585 22 3680101 23 7358673 24 14716604 25 29432713 26 58865262 27 117730441 28 235460844 29 470921661 30 941843314 31 1883686621