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A241530 as a simple table

na(n)
01
12
24
312
436
5120
6400
71400
84900
917640
1063504
11232848
12853776
133171168
1411778624
1544169840
16165636900
17625739400
182363904400
198982836720
2034134779536
21130332794592
22497634306624
231907598175392
247312459672336
2528124844893600
26108172480360000

[1,2,4,12,36,120,400,1400,4900,17640,63504,232848,
 853776,3171168,11778624,44169840,165636900,
 625739400,2363904400,8982836720,34134779536,
 130332794592,497634306624,1907598175392,
 7312459672336,28124844893600,108172480360000]