[1,2,6,20,73,281,1125,4635,19525,83710,364070,
1602327,7123041,31937010,144255802,655804649,
2998354717,13777825186,63596593430,294743653360,
1371017707245,6398580086645,29952930770185,
140604572777250,661708404611603,3121439743413256,
14756658303857332]
|