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A356506 as a simple table

na(n)
01
16
2120
33250
4103020
53587696
6133101836
75167564380
8207615129579
98567305854998
10361201849117032
1115498967122249676
12674906101555736960
1329757755664623031984
141326196334421645347368
1559655785739373960058296
162705420198806474232850741

[1,6,120,3250,103020,3587696,133101836,5167564380,
 207615129579,8567305854998,361201849117032,
 15498967122249676,674906101555736960,
 29757755664623031984,1326196334421645347368,
 59655785739373960058296,2705420198806474232850741]