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A002777 as a simple table

na(n)
01
10
20
30
44
516
680
7672
84896
949920
10460032
115598720
1262584320
13885381120
1411644323840
15187811205120
162841958748160
1751481298534400
18881192033648640
1917714783352913920
20338434210452602880
217477275543168614400

[1,0,0,0,4,16,80,672,4896,49920,460032,5598720,
 62584320,885381120,11644323840,187811205120,
 2841958748160,51481298534400,881192033648640,
 17714783352913920,338434210452602880,
 7477275543168614400]