# A056270 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 0
5 120
6 1800
7 16800
8 126000
9 834120
10 5102880
11 29607600
12 165526200
13 901020120
14 4808987400
15 25292030280
16 131542740000
17 678330198120
18 3474970629480
19 17710714165200
20 89904725757000