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A251956 as a simple table

na(n)
15484
211375
327550
4101307
5417045
61957438
710045910
853241089
9284500818
101525692838
118194567198
1244035052838
13236663562577
141272030531331
156837186368793
1636750266853365
17197535468185882
181061770169672789

[5484,11375,27550,101307,417045,1957438,10045910,
 53241089,284500818,1525692838,8194567198,
 44035052838,236663562577,1272030531331,
 6837186368793,36750266853365,197535468185882,
 1061770169672789]