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A099948 as a simple table

na(n)
31
46
525
690
7302
8994
93487
1015210
1192489
12713988
135979480
1450184316
15412595913
163317961318
1726241631409
18205918294518
191622545217510
2013045429410974
21109152638729439
22969395726250226
239255388478615017
2494973500733767432
251034488089509527120

[1,6,25,90,302,994,3487,15210,92489,713988,
 5979480,50184316,412595913,3317961318,26241631409,
 205918294518,1622545217510,13045429410974,
 109152638729439,969395726250226,9255388478615017,
 94973500733767432,1034488089509527120]