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A163526 as a simple table

na(n)
01
126
2650
316250
4406250
510155925
6253890000
76347047200
8158671110000
93966651000000
1099163106355300
112478998445300000
1261972980856207200
131549275016079700000
1438730637808401500000
15968235006358878382800

[1,26,650,16250,406250,10155925,253890000,
 6347047200,158671110000,3966651000000,
 99163106355300,2478998445300000,61972980856207200,
 1549275016079700000,38730637808401500000,
 968235006358878382800]