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A005973 as a simple table

na(n)
11
21
34
435
5541
613062
7444767
819912657
91121041222
1077048430033
116329916102841
12611728117464928
1368657066350744197
148854866422322096893
151300613343254300891316

[1,1,4,35,541,13062,444767,19912657,1121041222,
 77048430033,6329916102841,611728117464928,
 68657066350744197,8854866422322096893,
 1300613343254300891316]