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A259816 as a simple table

na(n)
14
212
364
4160
5676
61732
76440
816688
957620
10150580
11494776
121301208
134126100
1410903692
1533663256
1689287024
17269997636
18718153380
192136075840
205693969456
2116710504036
2244618212196

[4,12,64,160,676,1732,6440,16688,57620,150580,
 494776,1301208,4126100,10903692,33663256,89287024,
 269997636,718153380,2136075840,5693969456,
 16710504036,44618212196]