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A006665 as a simple table

na(n)
01
124
2276
32024
410602
541952
6128500
7303048
8517155
9463496
10-609684
11-3757992
12-9340852
13-14912280
14-12957624
158669712
1659707149
17132295080
18183499244
19131501856
20-113698752
21-575221744
22-1111921752
23-1363192680
24-824406065
25889513752
263638565960
276404250248

[1,24,276,2024,10602,41952,128500,303048,517155,
 463496,-609684,-3757992,-9340852,-14912280,
 -12957624,8669712,59707149,132295080,183499244,
 131501856,-113698752,-575221744,-1111921752,
 -1363192680,-824406065,889513752,3638565960,
 6404250248]