# A013239 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 0
4 -6
5 8
6 -135
7 448
8 -6300
9 35408
10 -496125
11 4051168
12 -59471874
13 643934744
14 -10139836707
15 136494374560
16 -2334659166840
17 37300690086560
18 -696737113793721
19 12786540011455552
20 -260937837571947070