# A013468 (b-file synthesized from sequence entry)
0 1
1 -1
2 -1
3 4
4 5
5 -32
6 -55
7 390
8 961
9 -6432
10 -22463
11 134550
12 649761
13 -3443208
14 -22456551
15 105379838
16 911433121
17 -3787776224
18 -42942180863
19 157078439014
20 2324211078513
21 -7384507525560
22 -143088139308519