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A231307 as a simple table

na(n)
00
11
2256
36562
465792
5397187
61745408
76161988
818522624
949208709
10118522624
11263567590
12548504320
131079298311
142024293376
153642188936
166319260672
1710617946377
1817339221248
1927601509418
2042939221248
2165424368779
2297815094784
23143735354060

[0,1,256,6562,65792,397187,1745408,6161988,
 18522624,49208709,118522624,263567590,548504320,
 1079298311,2024293376,3642188936,6319260672,
 10617946377,17339221248,27601509418,42939221248,
 65424368779,97815094784,143735354060]