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A123656 as a simple table

na(n)
13
281
3811
44353
516251
647953
7120051
8266241
9538003
101010001
111786203
123006721
134855371
147567953
1511441251
1616842753
1724221091
1834117201
1947176203
2064160001
2185960603
22113614161
23148315731
24191434753
25244531251
26309372753
27387951931

[3,81,811,4353,16251,47953,120051,266241,538003,
 1010001,1786203,3006721,4855371,7567953,11441251,
 16842753,24221091,34117201,47176203,64160001,
 85960603,113614161,148315731,191434753,244531251,
 309372753,387951931]