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A027653 as a simple table

na(n)
1-1
22
3-248
4492
5-4119
67256
7-33512
853008
9-192513
10287244
11-885480
121262512
13-3493982
144833456
15-12288992
1616576512
17-39493539
1852255768
19-117966288
20153541020
21-331534572
22425691312
23-884736744
241122626864
25-2257837845
262835861520
27-5541103056
286896878512

[-1,2,-248,492,-4119,7256,-33512,53008,-192513,
 287244,-885480,1262512,-3493982,4833456,-12288992,
 16576512,-39493539,52255768,-117966288,153541020,
 -331534572,425691312,-884736744,1122626864,
 -2257837845,2835861520,-5541103056,6896878512]