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A071356 as a simple table

na(n)
01
12
26
320
472
5272
61064
74272
817504
972896
10307648
111312896
125655808
1324562176
14107419264
15472675072
162091206144
179296612352
1841507566592
19186045061120
20836830457856
213776131489792
2217089399689216
2377548125675520
24352766964908032

[1,2,6,20,72,272,1064,4272,17504,72896,307648,
 1312896,5655808,24562176,107419264,472675072,
 2091206144,9296612352,41507566592,186045061120,
 836830457856,3776131489792,17089399689216,
 77548125675520,352766964908032]