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A317998 as a simple table

na(n)
11
24
316
496
5640
64480
732768
8247552
91915904
1015113216
11121069568
12982269952
138054767616
1466651537408
15555846729728
164667099709440
1739420882583552
18334730329587712
192855644020342784
2024464860907569152
21210393112063770624
221815582450311495680
2315716738746688733184
24136443973020569042944
251187652950607087534080
2610362818914536380170240

[1,4,16,96,640,4480,32768,247552,1915904,15113216,
 121069568,982269952,8054767616,66651537408,
 555846729728,4667099709440,39420882583552,
 334730329587712,2855644020342784,
 24464860907569152,210393112063770624,
 1815582450311495680,15716738746688733184,
 136443973020569042944,1187652950607087534080,
 10362818914536380170240]