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A138410 as a simple table

na(n)
156
2702
315500
4117306
51770230
64824612
724132656
847039022
9148023722
10594798932
11887473890
122565675756
134750035320
146321283542
1510779111506
1622164212252
1742180328262
1851520147380
1990458081406
20128099926010

[56,702,15500,117306,1770230,4824612,24132656,
 47039022,148023722,594798932,887473890,2565675756,
 4750035320,6321283542,10779111506,22164212252,
 42180328262,51520147380,90458081406,128099926010]