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A249461 as a simple table

na(n)
1860
22948
310124
434832
5119932
6412972
71422232
84898776
916874830
1058131580
11200257200
12689871586
132376578686
148187255382
1528204984386
1697165888404
17334735779168
181153163060226
193972642458048
2013685741942400
2147147347303294

[860,2948,10124,34832,119932,412972,1422232,
 4898776,16874830,58131580,200257200,689871586,
 2376578686,8187255382,28204984386,97165888404,
 334735779168,1153163060226,3972642458048,
 13685741942400,47147347303294]