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A115508 as a simple table

na(n)
11
22
36
44
54
640
7120
872
9140
10824
113312
1222320
13110976
141369536
159477120
163596160
173235584
1836927360
19286846848
20700001376
213321184800
2241563274304
23279121008576
243155690872704
2540885093117440
26827391601336320
2711517247876055040
2876396291822448640
29822435518222438400

[1,2,6,4,4,40,120,72,140,824,3312,22320,110976,
 1369536,9477120,3596160,3235584,36927360,
 286846848,700001376,3321184800,41563274304,
 279121008576,3155690872704,40885093117440,
 827391601336320,11517247876055040,
 76396291822448640,822435518222438400]