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A055071 as a simple table

na(n)
11
21
31
44
54
6144
7144
8576
95184
10518400
11518400
122073600
132073600
14101606400
15914457600
1614631321600
1714631321600
18526727577600
19526727577600
2052672757760000
2152672757760000
226373403688960000
236373403688960000
24917770131210240000
2522944253280256000000

[1,1,1,4,4,144,144,576,5184,518400,518400,2073600,
 2073600,101606400,914457600,14631321600,
 14631321600,526727577600,526727577600,
 52672757760000,52672757760000,6373403688960000,
 6373403688960000,917770131210240000,
 22944253280256000000]