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A268247 as a simple table

na(n)
16
2576
3216000
4197555340
5371713931400
61257212773492866
76967515866907769668
859102884914387317492904
9728462977173724674571341120
1012523133152298313854607312469836

[6,576,216000,197555340,371713931400,
 1257212773492866,6967515866907769668,
 59102884914387317492904,
 728462977173724674571341120,
 12523133152298313854607312469836]