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A178134 as a simple table

na(n)
00
11
21
32
4-3
5-2
6-32
7-81
8-311
9-810
10-2515
11-6864
12-19944
13-55043
14-156023
15-433522
16-1217427
17-3391226
18-9488456
19-26462205
20-73933535
21-206293134
22-576040339
23-1607642688
24-4488069168
25-12526662167
26-34967630447

[0,1,1,2,-3,-2,-32,-81,-311,-810,-2515,-6864,
 -19944,-55043,-156023,-433522,-1217427,-3391226,
 -9488456,-26462205,-73933535,-206293134,
 -576040339,-1607642688,-4488069168,-12526662167,
 -34967630447]