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A294037 as a simple table

na(n)
01
14
216
364
4232
5544
6-1664
7-37376
8-362024
9-2743712
10-17780864
11-98955776
12-442825664
13-1129423616
145536033792
15118591811584
161224814969816
179905491019104
1868032143081856
19398051159254528
201854461906222272
214784426026102528

[1,4,16,64,232,544,-1664,-37376,-362024,-2743712,
 -17780864,-98955776,-442825664,-1129423616,
 5536033792,118591811584,1224814969816,
 9905491019104,68032143081856,398051159254528,
 1854461906222272,4784426026102528]