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A237761 as a simple table

na(n)
18820
2357444
343136424
42003366400
5168088619064
68677001936104
7568560361960824
830824442951472416

[8820,357444,43136424,2003366400,168088619064,
 8677001936104,568560361960824,30824442951472416]