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A240372 as a simple table

na(n)
14
221
375
4450
51729
67233
736148
8139855
9645733
102919837
1111900426
1255182313
13238587617
141020077489
154627613220
1619831142375
1786874931360
18386104242606
191664229710205
207344843690603
2132253553194721
22140150173949016

[4,21,75,450,1729,7233,36148,139855,645733,
 2919837,11900426,55182313,238587617,1020077489,
 4627613220,19831142375,86874931360,386104242606,
 1664229710205,7344843690603,32253553194721,
 140150173949016]