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A026540 as a simple table

na(n)
31
42
56
616
736
8104
9215
10635
111275
123786
137518
1422344
1544170
16131264
17259002
18769578
191517418
204508580
218888495
2226412001
2352077234
24154773696
25305257251
26907432695
271790353357
285323519838
2910507386918
3031251588060

[1,2,6,16,36,104,215,635,1275,3786,7518,22344,
 44170,131264,259002,769578,1517418,4508580,
 8888495,26412001,52077234,154773696,305257251,
 907432695,1790353357,5323519838,10507386918,
 31251588060]