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A026771 as a simple table

na(n)
11
26
331
4156
5784
63962
720173
8103522
9535294
102787700
1114613710
1277072816
13408737760
142178631156
1511666175215
1662734622764
17338660977020
181834690352066
199971834477972
2054361287536706
21297170702049966
221628670524735842

[1,6,31,156,784,3962,20173,103522,535294,2787700,
 14613710,77072816,408737760,2178631156,
 11666175215,62734622764,338660977020,
 1834690352066,9971834477972,54361287536706,
 297170702049966,1628670524735842]