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A077903 as a simple table

na(n)
01
10
22
3-3
46
5-12
625
7-48
898
9-195
10390
11-780
121561
13-3120
146242
15-12483
1624966
17-49932
1899865
19-199728
20399458
21-798915
221597830
23-3195660
246391321
25-12782640
2625565282
27-51130563
28102261126
29-204522252
30409044505
31-818089008
321636178018
33-3272356035
346544712070

[1,0,2,-3,6,-12,25,-48,98,-195,390,-780,1561,
 -3120,6242,-12483,24966,-49932,99865,-199728,
 399458,-798915,1597830,-3195660,6391321,-12782640,
 25565282,-51130563,102261126,-204522252,409044505,
 -818089008,1636178018,-3272356035,6544712070]