# A089893 (b-file synthesized from sequence entry) 0 0 1 1 2 4 3 21 4 64 5 321 6 1092 7 5461 8 16384 9 81921 10 278532 11 1392661 12 4210752 13 21053761 14 71582788 15 357913941 16 1073741824 17 5368709121 18 18253611012 19 91268055061 20 275951648832 21 1379758244161 22 4691178030148 23 23455890150741