# A047026 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 14 4 47 5 161 6 558 7 2020 8 7398 9 27239 10 101807 11 383210 12 1447965 13 5507227 14 21038148 15 80597585 16 309861811 17 1194651520 18 4615681266 19 17872627858 20 69339129304 21 269437315070 22 1048578870090 23 4086453815450 24 15944711627177