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A137787 as a simple table

na(n)
0-2
1-4
2-4
326
4272
51826
610736
759426
8318272
91670786
108656976
1144454626
12226827872
131151991746
145830280816
1529429454626
16148249811072
17745630312706
183745590106256
1918797445635426
2094264432179872
21472428649241666
222366562219717296
2311850466059333026
2459322887352366272

[-2,-4,-4,26,272,1826,10736,59426,318272,1670786,
 8656976,44454626,226827872,1151991746,5830280816,
 29429454626,148249811072,745630312706,
 3745590106256,18797445635426,94264432179872,
 472428649241666,2366562219717296,
 11850466059333026,59322887352366272]