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A028860 as a simple table

na(n)
0-1
11
20
32
44
512
632
788
8240
9656
101792
114896
1213376
1336544
1499840
15272768
16745216
172035968
185562368
1915196672
2041518080
21113429504
22309895168
23846649344
242313089024
256319476736
2617265131520
2747169216512
28128868696064
29352075825152
30961889042432
312627929735168

[-1,1,0,2,4,12,32,88,240,656,1792,4896,13376,
 36544,99840,272768,745216,2035968,5562368,
 15196672,41518080,113429504,309895168,846649344,
 2313089024,6319476736,17265131520,47169216512,
 128868696064,352075825152,961889042432,
 2627929735168]