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A231542 as a simple table

na(n)
121
2485
315644
4417298
510928292
6296647240
78028429092
8216093538039
95824887373442
10157116139854017
114236458479008102
12114226125421270745
133080023255353736892
1483050203150277226101
152239360680062968080067

[21,485,15644,417298,10928292,296647240,
 8028429092,216093538039,5824887373442,
 157116139854017,4236458479008102,
 114226125421270745,3080023255353736892,
 83050203150277226101,2239360680062968080067]