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A222971 as a simple table

na(n)
11
26
396
4576
55180
628836
7222887
81241310
98712264
1048837168
11328280478
121854039060
1312126536066
1469047705664
15443482507552
162544063717888
1716136462307440
1893109093464048
19585311170019020
203393940344415872

[1,6,96,576,5180,28836,222887,1241310,8712264,
 48837168,328280478,1854039060,12126536066,
 69047705664,443482507552,2544063717888,
 16136462307440,93109093464048,585311170019020,
 3393940344415872]