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A197052 as a simple table

na(n)
15
216
378
4274
51132
64468
717742
870616
9281202
101117442
114448148
1217693664
1370390082
14280040518
151114106280
164432207738
1717633023628
1870149839190
19279079644000
201110273409628
214417041071578
2217572471614384
2369909222737482

[5,16,78,274,1132,4468,17742,70616,281202,1117442,
 4448148,17693664,70390082,280040518,1114106280,
 4432207738,17633023628,70149839190,279079644000,
 1110273409628,4417041071578,17572471614384,
 69909222737482]