# A259056 (b-file synthesized from sequence entry)
1 1
2 -3
3 -16
4 60
5 384
6 -1680
7 -12288
8 60480
9 491520
10 -2661120
11 -23592960
12 138378240
13 1321205760
14 -8302694400
15 -84557168640
16 564583219200
17 6088116142080
18 -42908324659200
19 -487049291366400
20 3604299271372800