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A176855 as a simple table

na(n)
01
11
20
3-2
4-8
5-25
6-72
7-197
8-514
9-1267
10-2884
11-5748
12-8468
13-119
1468688
15382434
161557232
175481369
1817494220
1951382510
20138541696
21335629309
22685402744
23919210879
24-913800290
25-13689355373
26-71111254588
27-287636394436

[1,1,0,-2,-8,-25,-72,-197,-514,-1267,-2884,-5748,
 -8468,-119,68688,382434,1557232,5481369,17494220,
 51382510,138541696,335629309,685402744,919210879,
 -913800290,-13689355373,-71111254588,
 -287636394436]