# A012761 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 7
4 -24
5 203
6 -1575
7 17869
8 -208152
9 2978653
10 -45883485
11 806530811
12 -15347080848
13 321642878919
14 -7260372461251
15 177107309744065
16 -4619185786492560
17 128667734086725657
18 -3805156334531373561