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A131951 as a simple table

na(n)
01
16
214
326
444
572
6118
7198
8344
9620
101154
112202
124276
138400
1416622
1533038
1665840
17131412
18262522
19524706
201049036
212097656
224194854
238389206
2416777864
2533555132
2667109618

[1,6,14,26,44,72,118,198,344,620,1154,2202,4276,
 8400,16622,33038,65840,131412,262522,524706,
 1049036,2097656,4194854,8389206,16777864,33555132,
 67109618]