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A166536 as a simple table

na(n)
01
13
26
316
440
5105
6273
7715
81870
94896
1012816
1133553
1287841
13229971
14602070
151576240
164126648
1710803705
1828284465
1974049691
20193864606
21507544128
221328767776
233478759201
249107509825
2523843770275
2662423800998
27163427632720

[1,3,6,16,40,105,273,715,1870,4896,12816,33553,
 87841,229971,602070,1576240,4126648,10803705,
 28284465,74049691,193864606,507544128,1328767776,
 3478759201,9107509825,23843770275,62423800998,
 163427632720]