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A123620 as a simple table

na(n)
01
14
216
360
4228
5864
63276
712420
847088
9178524
10676836
112566080
129728748
1336884484
14139839696
15530172540
162010036708
177620627744
1828891993356
19109537863300
20415289569968
211574482299804
225969315609316
2322631393727360
2485802128010028
25325300565212164

[1,4,16,60,228,864,3276,12420,47088,178524,676836,
 2566080,9728748,36884484,139839696,530172540,
 2010036708,7620627744,28891993356,109537863300,
 415289569968,1574482299804,5969315609316,
 22631393727360,85802128010028,325300565212164]