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A254944 as a simple table

na(n)
15
230
3157
4716
53051
613285
759419
8266171
91191961
105299332
1123303276
12103184617
13469076970
142179606815
1510148967055
1646714456830
17212033128454
18952381008960
194261219800255
2019166244488266
2187497696208789
22407910135348992

[5,30,157,716,3051,13285,59419,266171,1191961,
 5299332,23303276,103184617,469076970,2179606815,
 10148967055,46714456830,212033128454,952381008960,
 4261219800255,19166244488266,87497696208789,
 407910135348992]