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A197558 as a simple table

na(n)
15
257
3410
44055
536877
6310658
72817383
825115833
9223137190
101986928549
1117695730995
12157551002096
131402893385536
1412491465131399
15111225018303022
16990363617390993
178818318528316601
1878519303830481116
19699145265959550188

[5,57,410,4055,36877,310658,2817383,25115833,
 223137190,1986928549,17695730995,157551002096,
 1402893385536,12491465131399,111225018303022,
 990363617390993,8818318528316601,
 78519303830481116,699145265959550188]