# A260908 (b-file synthesized from sequence entry)
1 1
2 -2
3 3
4 -12
5 15
6 45
7 -105
8 420
9 -1890
10 -4725
11 10395
12 31185
13 -135135
14 -315315
15 -4729725
16 4729725
17 -80405325
18 -723647925
19 1527701175
20 7638505875
21 53469541125
22 117632990475
23 -245959889175
24 -737879667525
25 18446991688125
26 79936963981875
27 -2158298027510625