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A217786 as a simple table

na(n)
01
1-2
23
3-4
47
5-12
617
7-24
836
9-52
1071
11-96
12133
13-182
14240
15-316
16420
17-552
18713
19-916
201182
21-1516
221920
23-2424
243063
25-3852
264806
27-5976
287430
29-9204
3011336
31-13924
3217088
33-20908
3425473
35-30960
3637586
37-45518
3854939
39-66172
4079603
41-95556
42114399

[1,-2,3,-4,7,-12,17,-24,36,-52,71,-96,133,-182,
 240,-316,420,-552,713,-916,1182,-1516,1920,-2424,
 3063,-3852,4806,-5976,7430,-9204,11336,-13924,
 17088,-20908,25473,-30960,37586,-45518,54939,
 -66172,79603,-95556,114399]