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A026389 as a simple table

na(n)
21
38
449
5272
61440
77428
837730
9189808
10948909
114724160
1223453001
13116207424
14575036475
152842936320
1614046869575
1769378730880
18342590699955
191691519468760
208351553940355
2141235710124400
22203617691311370
231005560117623204

[1,8,49,272,1440,7428,37730,189808,948909,4724160,
 23453001,116207424,575036475,2842936320,
 14046869575,69378730880,342590699955,
 1691519468760,8351553940355,41235710124400,
 203617691311370,1005560117623204]