# A124810 (b-file synthesized from sequence entry) 3 3 4 12 5 54 6 198 7 729 8 2538 9 8748 10 29484 11 98415 12 324648 13 1062882 14 3454002 15 11160261 16 35871174 17 114791256 18 365893848 19 1162261467 20 3680484804 21 11622614670 22 36611206686 23 115063885233 24 360882096930 25 1129718145924 26 3530368940292