# A150667 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 24
4 104
5 360
6 1624
7 6048
8 27936
9 108864
10 510464
11 2051456
12 9719808
13 39947648
14 190710272
15 797306880
16 3828298240
17 16222254080
18 78243672064
19 335196917760
20 1622603599872
21 7014447820800
22 34056365273088
23 148351482904576
24 722064346365952
25 3165937025024000
26 15441892448436224
27 68089360118611968