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A180375 as a simple table

na(n)
14
2147
31236
411586
5100704
6909780
78061360
872279888
9644409672
105763665256
1151460343508
12459865182720
134107418650972
1436696235666668
15327803328407400
162928457191806580
1726160556962790800
18233703185202652428

[4,147,1236,11586,100704,909780,8061360,72279888,
 644409672,5763665256,51460343508,459865182720,
 4107418650972,36696235666668,327803328407400,
 2928457191806580,26160556962790800,
 233703185202652428]