# A224540 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 12 4 36 5 106 6 249 7 613 8 1732 9 8028 10 23348 11 69370 12 210807 13 634839 14 1893582 15 5686389 16 17031777 17 51073675 18 153185957 19 459516225 20 1378707224 21 4135278456