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A318047 as a simple table

na(n)
11
28
381
41028
515780
6284652
75903464
8138407544
93619892160
10104485268960
113299177464704
12113120695539612
134185473097734656
14166217602768452900
157051983744002135040
16318324623296131263408
1715232941497754507165696
18770291040239888149405944
1941042353622873800536064000
202298206207793743728251532020

[1,8,81,1028,15780,284652,5903464,138407544,
 3619892160,104485268960,3299177464704,
 113120695539612,4185473097734656,
 166217602768452900,7051983744002135040,
 318324623296131263408,15232941497754507165696,
 770291040239888149405944,
 41042353622873800536064000,
 2298206207793743728251532020]