# A361596 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 15 4 99 5 795 6 7485 7 80745 8 981225 9 13253625 10 196834995 11 3185662095 12 55770765435 13 1049572599075 14 21120725230605 15 452384160453225 16 10272547048388625 17 246434674107647025 18 6226347228582355875 19 165224032352989584975 20 4593512876411509125075