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A201919 as a simple table

na(n)
10
21
37
48
549
6148
7344
82401
936016
10151264
11386561
121764736
135764801
1446941952
1558471553
16374712065
171101076992
184802079233
1915858967552
20139825248256
21149429406721
221595702681601
232453862488064
2414602557997056
2542091354378241
26127990382747648

[0,1,7,8,49,148,344,2401,36016,151264,386561,
 1764736,5764801,46941952,58471553,374712065,
 1101076992,4802079233,15858967552,139825248256,
 149429406721,1595702681601,2453862488064,
 14602557997056,42091354378241,127990382747648]