# A007236 (b-file synthesized from sequence entry)
0 1
1 -7
2 18
3 -24
4 24
5 6
6 66
7 258
8 1014
9 3906
10 14760
11 54696
12 198510
13 704010
14 2431110
15 8130096
16 26103624
17 79292226
18 221534442
19 532863372
20 870102906
21 -842584128
22 -17420140980
23 -111985825752
24 -559952980782
25 -2460921694668
26 -9861404819574
27 -36339628229910