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A180239 as a simple table

na(n)
01
14
216
364
4244
5856
62776
78356
823032
959200
10142624
11324484
12696256
131422436
142779900
155219452
169455596

[1,4,16,64,244,856,2776,8356,23032,59200,142624,
 324484,696256,1422436,2779900,5219452,9455596]