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A253087 as a simple table

na(n)
01
14
212
348
4144
5440
61816
76816
825816
9101856
10397944
111573464
126274560
1325071152
14100180872
15400625360

[1,4,12,48,144,440,1816,6816,25816,101856,397944,
 1573464,6274560,25071152,100180872,400625360]