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A136257 as a simple table

na(n)
01
120
2437
310461
4270726
57456194
6215666696
76485151199
8201183083017
96401210746834
10207969967925893
116875935591529309

[1,20,437,10461,270726,7456194,215666696,
 6485151199,201183083017,6401210746834,
 207969967925893,6875935591529309]