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A251290 as a simple table

na(n)
1710
26980
352474
4518711
54109933
639473392
7322933003
83029148345
925329125380
10233446638426
111982115626688
1218037238240402
13154814235264090
141396031401262723
1512074721586104881
16108177851601726601

[710,6980,52474,518711,4109933,39473392,322933003,
 3029148345,25329125380,233446638426,1982115626688,
 18037238240402,154814235264090,1396031401262723,
 12074721586104881,108177851601726601]