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A337737 as a simple table

na(n)
01
12
26
315
412
525
643
773
8480
91981
103205
119038
1216099
13376340
14211318
152461230
162253517
1716907618
18106308537
19312911063

[1,2,6,15,12,25,43,73,480,1981,3205,9038,16099,
 376340,211318,2461230,2253517,16907618,106308537,
 312911063]