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A001981 as a simple table

na(n)
01
11
25
313
433
573
6151
7289
8526
9910
101514
112430
123788
135744
148512
1512346
1617575
1724591
1833885
1946029
2061731
2181805
22107233
23139143
24178870
25227930
26288100
27361384
28450096
29556834
30684572
31836618
321016737
331229093
341478379
351769773

[1,1,5,13,33,73,151,289,526,910,1514,2430,3788,
 5744,8512,12346,17575,24591,33885,46029,61731,
 81805,107233,139143,178870,227930,288100,361384,
 450096,556834,684572,836618,1016737,1229093,
 1478379,1769773]