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A265803 as a simple table

na(n)
0-7
1-29
2-67
3-185
4-475
5-1253
6-3271
7-8573
8-22435
9-58745
10-153787
11-402629
12-1054087
13-2759645
14-7224835
15-18914873
16-49519771
17-129644453
18-339413575
19-888596285
20-2326375267
21-6090529529
22-15945213307
23-41745110405
24-109290117895
25-286125243293

[-7,-29,-67,-185,-475,-1253,-3271,-8573,-22435,
 -58745,-153787,-402629,-1054087,-2759645,-7224835,
 -18914873,-49519771,-129644453,-339413575,
 -888596285,-2326375267,-6090529529,-15945213307,
 -41745110405,-109290117895,-286125243293]