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A121357 as a simple table

na(n)
01
11
22
312
490
5546
66156
781432
8942012
915114780
10294765336
115069224656
12108842183352
132770895886552
1464609245619920
151742542175582496
1655074355772360976
171626315165597840912
1853331321825434963232

[1,1,2,12,90,546,6156,81432,942012,15114780,
 294765336,5069224656,108842183352,2770895886552,
 64609245619920,1742542175582496,55074355772360976,
 1626315165597840912,53331321825434963232]