# A350881 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 24 5 50 6 140 7 368 8 1152 9 3682 10 11784 11 39902 12 134612 13 463066 14 1635092 15 5818384 16 20684072 17 73693068 18 266943648 19 967762792 20 3533666568 21 13036452946 22 48102671884 23 178315730764 24 661567489568 25 2450447537226 26 9123572154720 27 34201574126260