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A081663 as a simple table

na(n)
01
13
29
325
466
5169
6425
71058
82621
96485
1016066
1139921
1299601
13249666
14628917
151592029
164048866
1710341577
1826517113
1968226722
20176065901
21455514533
221181040514
233067684065
247980068641
2520784441474
2654188706405
27141395801773

[1,3,9,25,66,169,425,1058,2621,6485,16066,39921,
 99601,249666,628917,1592029,4048866,10341577,
 26517113,68226722,176065901,455514533,1181040514,
 3067684065,7980068641,20784441474,54188706405,
 141395801773]