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A123045 as a simple table

na(n)
00
12
26
312
439
5104
6366
71172
84179
914572
1052740
11190652
12700274
132581112
149591666
1535791472
16134236179
17505290272
181908947406
197233629132
2027488079132
21104715393912
22399823554006
231529755308212
245864066561554
2522517998136936
2686607703209516

[0,2,6,12,39,104,366,1172,4179,14572,52740,190652,
 700274,2581112,9591666,35791472,134236179,
 505290272,1908947406,7233629132,27488079132,
 104715393912,399823554006,1529755308212,
 5864066561554,22517998136936,86607703209516]