# A293021 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 24
4 192
5 1880
6 21312
7 266504
8 3469312
9 42094656
10 297625600
11 -8727514752
12 -659406274560
13 -31019532622208
14 -1314656227540992
15 -54314985911216640
16 -2248955319931633664
17 -94369141109824233472
18 -4028982346754921594880
19 -175032005028072692797440