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A014131 as a simple table

na(n)
00
16
212
330
460
5126
6252
7510
81020
92046
104092
118190
1216380
1332766
1465532
15131070
16262140
17524286
181048572
192097150
204194300
218388606
2216777212
2333554430
2467108860
25134217726
26268435452
27536870910

[0,6,12,30,60,126,252,510,1020,2046,4092,8190,
 16380,32766,65532,131070,262140,524286,1048572,
 2097150,4194300,8388606,16777212,33554430,
 67108860,134217726,268435452,536870910]