# A046984 (b-file synthesized from sequence entry)
0 1
1 4
2 18
3 88
4 468
5 2672
6 16072
7 100064
8 636368
9 4097984
10 26579488
11 173093760
12 1129796928
13 7383588608
14 48287978624
15 315921649152
16 2067346607360
17 13530037877760
18 88555066819072
19 579620448450560
20 3793872862974976
21 24832858496561152
22 162544900186359808