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A215666 as a simple table

na(n)
00
1-3
26
3-9
421
5-33
672
7-120
8249
9-432
10867
11-1545
123033
13-5502
1410644
15-19539
1637434
17-69261
18131841
19-245217
20464784
21-867492
221639569
23-3067260
245786199
25-10841349
2620425857
27-38310246
2872118920
29-135356595
30254667006
31-478188705
32899357613

[0,-3,6,-9,21,-33,72,-120,249,-432,867,-1545,3033,
 -5502,10644,-19539,37434,-69261,131841,-245217,
 464784,-867492,1639569,-3067260,5786199,-10841349,
 20425857,-38310246,72118920,-135356595,254667006,
 -478188705,899357613]