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A211568 as a simple table

na(n)
124
244
378
4142
5256
6472
7868
81626
93046
105790
1111016
1221196
1340828
1479318
15154246
16301890
17591328
181163856
192292084
204530250
218957830
2217760094
2335222584
2469994044
25139121260
26276928662
27551322342
281098804034
292190169552
304369076320

[24,44,78,142,256,472,868,1626,3046,5790,11016,
 21196,40828,79318,154246,301890,591328,1163856,
 2292084,4530250,8957830,17760094,35222584,
 69994044,139121260,276928662,551322342,1098804034,
 2190169552,4369076320]