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A147979 as a simple table

na(n)
1-6
2-20
3-76
4-272
5-580
63760
777324
8896848
98869820
1081550960
11719926124
126196609168
1352439953820
14438516694960
153635082523724
1629935019892688
17245264010263420
182001462391659760
1916280541150478124
20132087583623451408

[-6,-20,-76,-272,-580,3760,77324,896848,8869820,
 81550960,719926124,6196609168,52439953820,
 438516694960,3635082523724,29935019892688,
 245264010263420,2001462391659760,
 16280541150478124,132087583623451408]