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A142703 as a simple table

na(n)
11
21
38
454
5496
65500
771952
81084328
918500480
10352526544
117420540480
12171007474528
134282272360192
14115785275702720
153361891345761536
16104330298643927680
173446150079670054912
18120716332862675408128

[1,1,8,54,496,5500,71952,1084328,18500480,
 352526544,7420540480,171007474528,4282272360192,
 115785275702720,3361891345761536,
 104330298643927680,3446150079670054912,
 120716332862675408128]