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A222668 as a simple table

na(n)
10
22
32
440
590
61336
73458
844516
9126476
101527344
114599422
1253131172
13167316392
141872027432
156086187592
1666611566008
17221500197840
182388653206624
198068017360224
2086178588357352
21294198667299936
223124170165050528

[0,2,2,40,90,1336,3458,44516,126476,1527344,
 4599422,53131172,167316392,1872027432,6086187592,
 66611566008,221500197840,2388653206624,
 8068017360224,86178588357352,294198667299936,
 3124170165050528]