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A370545 as a simple table

na(n)
11
21
34
421
5125
6801
75388
837518
9268109
101955000
1114487754
12108794169
13826054062
146331064385
1548914088750
16380555960864
172978892961194
1823444095375593
19185394136871818
201472396312841250
2111739089289817538
2293921736129064325
23753845680317416682
246068255413854119432

[1,1,4,21,125,801,5388,37518,268109,1955000,
 14487754,108794169,826054062,6331064385,
 48914088750,380555960864,2978892961194,
 23444095375593,185394136871818,1472396312841250,
 11739089289817538,93921736129064325,
 753845680317416682,6068255413854119432]