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A135507 as a simple table

na(n)
11
24
320
460
5180
6540
74860
819440
958320
10174960
112274480
126823440
1320470320
14184232880
15552698640
161658095920
1731503822480
1894511467440
19283534402320
20850603206960
217655428862640
2299520575214320
232488014380358000

[1,4,20,60,180,540,4860,19440,58320,174960,
 2274480,6823440,20470320,184232880,552698640,
 1658095920,31503822480,94511467440,283534402320,
 850603206960,7655428862640,99520575214320,
 2488014380358000]