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A111876 as a simple table

na(n)
01
16
230
3420
41260
513860
6180180
772072
81225224
9116396280
10116396280
112677114440
1213385572200
135736673800
14166363540200
1510314539492400
1610314539492400
1772201776446800
182671465728531600
192671465728531600

[1,6,30,420,1260,13860,180180,72072,1225224,
 116396280,116396280,2677114440,13385572200,
 5736673800,166363540200,10314539492400,
 10314539492400,72201776446800,2671465728531600,
 2671465728531600]