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A020568 as a simple table

na(n)
01
127
2499
37863
4113731
51561647
620724139
7268611543
83422947891
943073421567
10536871293179
116642406690023
1281708636139651
131000502412972687
1412206022852156619
15148472243708301303

[1,27,499,7863,113731,1561647,20724139,268611543,
 3422947891,43073421567,536871293179,6642406690023,
 81708636139651,1000502412972687,12206022852156619,
 148472243708301303]