# A114201 (b-file synthesized from sequence entry) 0 1 1 24 2 450 3 7700 4 126126 5 2018016 6 31855824 7 498841200 8 7773608700 9 120784604512 10 1873533922260 11 29034766346040 12 449790717967500 13 6967723880880000 14 107959904588606400 15 1673378521123399200 16 25949671331244477300 17 402629171550425820000 18 6250759024406391495000