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A013148 as a simple table

na(n)
02
1-20
2872
3-82848
413615232
5-3427600128
61224824628224
7-589372636243968
8367372633732907008
9-287938978919399424000
10277156456747324043952128
11-321405895510495023427223552

[2,-20,872,-82848,13615232,-3427600128,
 1224824628224,-589372636243968,367372633732907008,
 -287938978919399424000,277156456747324043952128,
 -321405895510495023427223552]