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A020981 as a simple table

na(n)
01
131
2645
311255
4177821
52636991
637440565
7515147335
86923011341
991364030351
101188608942885
1115286543614615
12194762842152061
132462271368182111
1430927944350627605
15386358083836485095

[1,31,645,11255,177821,2636991,37440565,515147335,
 6923011341,91364030351,1188608942885,
 15286543614615,194762842152061,2462271368182111,
 30927944350627605,386358083836485095]