# A156089 (b-file synthesized from sequence entry)
0 0
1 -1
2 3
3 -22
4 147
5 -1009
6 6912
7 -47377
8 324723
9 -2225686
10 15255075
11 -104559841
12 716663808
13 -4912086817
14 33667943907
15 -230763520534
16 1581676699827
17 -10840973378257
18 74305136947968
19 -509294985257521
20 3490759759854675