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A251883 as a simple table

na(n)
1256604
2725325
32892699
414269266
596631623
6615536028
73186483082
821970640444
9143585893407
10763905174081
115329570585851
1235325618021657
13191417416912064
141344984048889486
159001481313346745
1649409963417590684

[256604,725325,2892699,14269266,96631623,
 615536028,3186483082,21970640444,143585893407,
 763905174081,5329570585851,35325618021657,
 191417416912064,1344984048889486,9001481313346745,
 49409963417590684]