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A098557 as a simple table

na(n)
00
11
22
32
48
524
6144
7720
85760
940320
10403200
113628800
1243545600
13479001600
146706022400
1587178291200
161394852659200
1720922789888000
18376610217984000
196402373705728000
20128047474114560000
212432902008176640000
2253523844179886080000
231124000727777607680000

[0,1,2,2,8,24,144,720,5760,40320,403200,3628800,
 43545600,479001600,6706022400,87178291200,
 1394852659200,20922789888000,376610217984000,
 6402373705728000,128047474114560000,
 2432902008176640000,53523844179886080000,
 1124000727777607680000]