# A138238 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 9
4 -16
5 105
6 -336
7 1513
8 -5712
9 23529
10 -92752
11 373737
12 -1489488
13 5968873
14 -23853648
15 95458281
16 -381745744
17 1527157737
18 -6108281424
19 24433824745
20 -97733900880
21 390938399721
22 -1563748006480