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A278618 as a simple table

na(n)
01
10
25
37
445
5121
6533
71800
87157
926239
10101640
11384583
121483925
135693247
1422013059
1585076183
16330014421
171281349195
184985766650
1919422653367
2075775163028
21295953650376
221157212653030
234529183513913
2417743019073381
2569565441895001

[1,0,5,7,45,121,533,1800,7157,26239,101640,384583,
 1483925,5693247,22013059,85076183,330014421,
 1281349195,4985766650,19422653367,75775163028,
 295953650376,1157212653030,4529183513913,
 17743019073381,69565441895001]