# A002891 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 1
4 0
5 3
6 -3
7 15
8 -30
9 101
10 -261
11 807
12 -2308
13 7065
14 -21171
15 65337
16 -200934
17 627249
18 -1962034
19 6192066
20 -19610346
21 62482527
22 -199807110
23 641837193
24 -2068695927
25 6691611633
26 -21710041944
27 70645706963
28 -230488840446
29 753903842400
30 -2471624380458
31 8120879664294
32 -26736570257010