# A143561 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 24
4 88
5 280
6 1064
7 3672
8 14456
9 52184
10 210504
11 782232
12 3210904
13 12176792
14 50638440
15 194956248
16 818961080
17 3189915224
18 13508052104
19 53105011480
20 226355549400
21 896636646936
22 3842662060200
23 15317408281944
24 65946510374136