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A339240 as a simple table

na(n)
00
12
214
378
4396
51910
68916
740684
8182552
9808614
103545220
1115414212
1266556584
13285707708
141220340296
155189913240
1621988512304
1792850096902
18390913863012
191641450064084
206876023427080
2128741451864916
22119902111845208
23499304732388968
242075821104461136
258617006998238300

[0,2,14,78,396,1910,8916,40684,182552,808614,
 3545220,15414212,66556584,285707708,1220340296,
 5189913240,21988512304,92850096902,390913863012,
 1641450064084,6876023427080,28741451864916,
 119902111845208,499304732388968,2075821104461136,
 8617006998238300]