# A049136 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 6 5 22 6 90 7 392 8 1775 9 8252 10 39114 11 188220 12 916920 13 4512880 14 22406488 15 112092264 16 564474555 17 2859167178 18 14557198500 19 74459570756 20 382441401734 21 1971683051152 22 10199692593804 23 52927874586704 24 275432533945182