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A226558 as a simple table

na(n)
164
21984
323232
4153824
5724352
62661504
78208640
822114304
953570368
10119129856
11246971072
12482429024
13896290944
141594476160
152732250688
164529267712
177292346816
1811438236320
1917528382400
2026300206624

[64,1984,23232,153824,724352,2661504,8208640,
 22114304,53570368,119129856,246971072,482429024,
 896290944,1594476160,2732250688,4529267712,
 7292346816,11438236320,17528382400,26300206624]