# A132051 (b-file synthesized from sequence entry)
6 1
7 63
8 2730
9 103950
10 3786615
11 137162025
12 5039703900
13 189883593900
14 7381251402525
15 297032627967075
16 12395985005353950
17 536910000482705850
18 24139951470365605875
19 1126381171697414758125
20 54517938404202375102000