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A189746 as a simple table

na(n)
15
22
320
4104
5560
63008
716160
886816
9466400
102505632
1113460960
1272316064
13388502240
142087143328
1511212721120
1660237892256
17323614903520
181738550302112
199339981317600
2050177007192224
21269564998596320
221448179007366048
237780025034022880
2441796483184846496

[5,2,20,104,560,3008,16160,86816,466400,2505632,
 13460960,72316064,388502240,2087143328,
 11212721120,60237892256,323614903520,
 1738550302112,9339981317600,50177007192224,
 269564998596320,1448179007366048,7780025034022880,
 41796483184846496]