# A009774 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -2
4 14
5 -14
6 -286
7 1828
8 3464
9 -130664
10 619304
11 7421008
12 -128214736
13 153779536
14 18052524944
15 -209102239712
16 -1370716606336
17 63200892286336
18 -414519986847616
19 -12766540334296832
20 303340786629265664