# A145640 (b-file synthesized from sequence entry) 1 1 2 3 3 5 4 35 5 315 6 3465 7 45045 8 45045 9 255255 10 969969 11 29393 12 2028117 13 50702925 14 456326325 15 13233463425 16 820474732350 17 4512611027925 18 4512611027925 19 166966608033225 20 12843585233325 21 526586994566325 22 22643240766351975