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A275758 as a simple table

na(n)
11
21
34
421
5126
6817
75574
839418
9286286
102122491
1115995696
12122166551
13943430560
147353998931
1557783603764
16457176705018
173639000808140
1829119701312548
19234120338807316
201890257713736568
2115319612051101438
22124583720191974904
231016307862050772614
248314217332992596050
2568193993494598345010
26560671685990956975367
274619857060146629819160
2838144728242794104501561
29315546193363448088862064
302614910268303053285326541

[1,1,4,21,126,817,5574,39418,286286,2122491,
 15995696,122166551,943430560,7353998931,
 57783603764,457176705018,3639000808140,
 29119701312548,234120338807316,1890257713736568,
 15319612051101438,124583720191974904,
 1016307862050772614,8314217332992596050,
 68193993494598345010,560671685990956975367,
 4619857060146629819160,38144728242794104501561,
 315546193363448088862064,
 2614910268303053285326541]