# A232974 (b-file synthesized from sequence entry) 0 1 1 2 2 2 3 10 4 66 5 538 6 5170 7 56906 8 704226 9 9671930 10 145992338 11 2403271594 12 42869336130 13 824103252058 14 16991417367538 15 374154425946890 16 8765990409737634 17 217771226025864122 18 5718895163944768850 19 158315176568802482794 20 4608155971186431515394