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A004404 as a simple table

na(n)
01
1-6
224
3-80
4234
5-624
61552
7-3648
88184
9-17654
1036816
11-74544
12147056
13-283440
14535008
15-990912
161803882
17-3232224
185707624
19-9943536
2017106960
21-29088352
2248922320
23-81438528
24134261584
25-219336630
26355242288

[1,-6,24,-80,234,-624,1552,-3648,8184,-17654,
 36816,-74544,147056,-283440,535008,-990912,
 1803882,-3232224,5707624,-9943536,17106960,
 -29088352,48922320,-81438528,134261584,-219336630,
 355242288]