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A147978 as a simple table

na(n)
1-5
2-14
3-42
4-98
5126
64606
750478
8446782
93622206
1028040446
11211134798
121561328062
1311403051486
1482538901886
15593482158318
164245770823742
1730254894691966
18214923605948926
191522969836817038
2010770185918341822

[-5,-14,-42,-98,126,4606,50478,446782,3622206,
 28040446,211134798,1561328062,11403051486,
 82538901886,593482158318,4245770823742,
 30254894691966,214923605948926,1522969836817038,
 10770185918341822]