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A246512 as a simple table

na(n)
11
28
387
41334
525045
6529080
712076435
8291307490
97325385345
10190294925864
115074233846583
12138240914882394
133834434331534781
14107990908896551192
153081524055740420811
1688938694296657330170
172592715751635344852505
1876252823735941187830920
192260342454730542009915455
2067476975730679069406101870

[1,8,87,1334,25045,529080,12076435,291307490,
 7325385345,190294925864,5074233846583,
 138240914882394,3834434331534781,
 107990908896551192,3081524055740420811,
 88938694296657330170,2592715751635344852505,
 76252823735941187830920,2260342454730542009915455,
 67476975730679069406101870]