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A259815 as a simple table

na(n)
14
216
368
4232
5796
62528
78036
824520
974796
10222400
11660868
121929944
135631748
1416228768
1546730860
16133288872
17379917092
181074853312
193039122932
208541661232
2123994293596
2267070070848
23187391828604

[4,16,68,232,796,2528,8036,24520,74796,222400,
 660868,1929944,5631748,16228768,46730860,
 133288872,379917092,1074853312,3039122932,
 8541661232,23994293596,67070070848,187391828604]