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A266800 as a simple table

na(n)
0-8
1-12
2-98
3-636
4-4424
5-30138
6-207032
7-1417788
8-9720866
9-66619404
10-456638168
11-3129787002
12-21452029928
13-147034005996
14-1007787102434
15-6907472856348
16-47344530365672
17-324504220137018
18-2224185061818776
19-15244791078484764
20-104489352838678178

[-8,-12,-98,-636,-4424,-30138,-207032,-1417788,
 -9720866,-66619404,-456638168,-3129787002,
 -21452029928,-147034005996,-1007787102434,
 -6907472856348,-47344530365672,-324504220137018,
 -2224185061818776,-15244791078484764,
 -104489352838678178]