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A156422 as a simple table

na(n)
01
11680
21756860
3449345680
433899743010
5896812758240
610075020851140
765214945341280
8366766557522330
92033591738777760
109808527088125024
1142048089482202384

[1,1680,1756860,449345680,33899743010,
 896812758240,10075020851140,65214945341280,
 366766557522330,2033591738777760,9808527088125024,
 42048089482202384]