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A233718 as a simple table

na(n)
1280
21820
311016
468828
5423220
62624872
716201200
8100277820
9619644916
103832773404
1123693063108
12146517647480
13905857050536
145601325392044
1534632490183556
16214141349297724
171324043851903528
188186789590614456

[280,1820,11016,68828,423220,2624872,16201200,
 100277820,619644916,3832773404,23693063108,
 146517647480,905857050536,5601325392044,
 34632490183556,214141349297724,1324043851903528,
 8186789590614456]