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A271944 as a simple table

na(n)
00
12
24
322
456
5250
6732
72926
89264
934866
10115316
11419846
121422824
135086122
1417471692
1561823966
16213983072
17752927074
182616950756
199179311350
2031978941080
21111975792474
22390606950844
231366410142030
244769896907152
2516676981234578
2658239643256916

[0,2,4,22,56,250,732,2926,9264,34866,115316,
 419846,1422824,5086122,17471692,61823966,
 213983072,752927074,2616950756,9179311350,
 31978941080,111975792474,390606950844,
 1366410142030,4769896907152,16676981234578,
 58239643256916]