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A275540 as a simple table

na(n)
01
10
21
35
427
5129
6761
75137
840695
9363815
103632629
1139927183
12479047667
136227155921
1487178936305
151307676395009
1620922800209903
17355687462555407
186402373891522541
19121645101063561055
202432902011892531179

[1,0,1,5,27,129,761,5137,40695,363815,3632629,
 39927183,479047667,6227155921,87178936305,
 1307676395009,20922800209903,355687462555407,
 6402373891522541,121645101063561055,
 2432902011892531179]