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A278417 as a simple table

na(n)
00
12
214
378
4388
51810
68106
735294
8150536
9632034
102620870
1110759342
1243804812
13177105266
14711809378
152846259390
1611330543632
1744929049794
18177540878718
19699402223118
202747583822740
2110766828545746
2242095796462874
23164244726238366
24639620518118424
252486558615814050
269651161613824822
2737403957244654702

[0,2,14,78,388,1810,8106,35294,150536,632034,
 2620870,10759342,43804812,177105266,711809378,
 2846259390,11330543632,44929049794,177540878718,
 699402223118,2747583822740,10766828545746,
 42095796462874,164244726238366,639620518118424,
 2486558615814050,9651161613824822,
 37403957244654702]