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A247904 as a simple table

na(n)
01
16
221
356
4131
5286
6601
71236
82511
95066
1010181
1120416
1240891
1381846
14163761
15327596
16655271
171310626
182621341
195242776
2010485651
2120971406
2241942921
2383885956
24167772031
25335544186
26671088501
271342177136
282684354411
295368708966
3010737418081

[1,6,21,56,131,286,601,1236,2511,5066,10181,20416,
 40891,81846,163761,327596,655271,1310626,2621341,
 5242776,10485651,20971406,41942921,83885956,
 167772031,335544186,671088501,1342177136,
 2684354411,5368708966,10737418081]