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A123950 as a simple table

na(n)
10
21
31
46
519
673
7264
8973
93565
1013086
1148007
12176149
13646296
142371321
158700553
1631923030
17117128107
18429752305
191576795176
205785386229
2121227039605
2277883687150
23285761407807
241048481205661
253846960466104
2614114802199681
2751788325586033

[0,1,1,6,19,73,264,973,3565,13086,48007,176149,
 646296,2371321,8700553,31923030,117128107,
 429752305,1576795176,5785386229,21227039605,
 77883687150,285761407807,1048481205661,
 3846960466104,14114802199681,51788325586033]