# A009473 (b-file synthesized from sequence entry)
0 1
1 -4
2 68
3 -2472
4 152144
5 -14034560
6 1799730624
7 -304857999232
8 65741679927552
9 -17551668357299200
10 5675908680156886016
11 -2184408933211162445824
12 986028359061107747639296
13 -515674384290974756211654656