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A368956 as a simple table

na(n)
1-2
20
310
448
5178
6600
71930
86048
918658
1057000
11173050
12523248
131577938
144750200
1514283370
1642915648
17128878018
18386896200
191161212890
203484687248
2110456158898
2231372671000
2394126401610
24282395982048
25847221500578
262541731610600
277625329049530

[-2,0,10,48,178,600,1930,6048,18658,57000,173050,
 523248,1577938,4750200,14283370,42915648,
 128878018,386896200,1161212890,3484687248,
 10456158898,31372671000,94126401610,282395982048,
 847221500578,2541731610600,7625329049530]