# A155084 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 32
4 132
5 552
6 2328
7 9872
8 42020
9 179336
10 766888
11 3284272
12 14081224
13 60426576
14 259490736
15 1114965792
16 4792924356
17 20611174920
18 88662405768
19 381494338032
20 1641837542232
21 7067257125744
22 30425523536592