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A052647 as a simple table

na(n)
02
12
210
348
4408
53840
646800
7645120
810362240
9185794560
103719520000
1181749606400
121962469555200
1351011754393600
141428416301312000
1542849873690624000
161371216880889856000
1746620662575398912000

[2,2,10,48,408,3840,46800,645120,10362240,
 185794560,3719520000,81749606400,1962469555200,
 51011754393600,1428416301312000,42849873690624000,
 1371216880889856000,46620662575398912000]