# A001410 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 28 5 65 6 149 7 341 8 777 9 1769 10 4022 11 9140 12 20763 13 47156 14 107086 15 243162 16 552128 17 1253640 18 2846424 19 6462827 20 14673824 21 33316766 22 75645245 23 171751292 24 389958283 25 885393129 26 2010268490