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A251152 as a simple table

na(n)
1470
28407
3148833
42644832
546958048
6833966807
714810089440
8263012232516
94670807329618
1082948521103259
111473076057445537
1226160241273743965
13464577643321668439
148250397474900690408
15146518153252603690037

[470,8407,148833,2644832,46958048,833966807,
 14810089440,263012232516,4670807329618,
 82948521103259,1473076057445537,26160241273743965,
 464577643321668439,8250397474900690408,
 146518153252603690037]