# A242511 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 28 5 100 6 330 7 1050 8 3024 9 8736 10 23220 11 62700 12 158004 13 406692 14 986986 15 2452450 16 5788640 17 14002560 18 32357052 19 76640148 20 174174520 21 405623400 22 909582212 23 2089064516 24 4633556448 25 10519464000 26 23120533800 27 51977741400 28 113365499940 29 252725219460 30 547593359850 31 1211884139250 32 2610998927040 33 5741708459520 34 12309472580460 35 26917328938500 36 57457069777800 37 125016198060600 38 265832233972140 39 575824335603660 40 1220234181784800