# A151022 (b-file synthesized from sequence entry)
0 1
1 2
2 10
3 36
4 180
5 752
6 3760
7 16736
8 83680
9 385344
10 1926720
11 9058512
12 45292560
13 215891600
14 1079458000
15 5195196624
16 25975983120
17 125901336112
18 629506680560
19 3067403607504
20 15337018037520
21 75041661844720
22 375208309223600
23 1841832138224720
24 9209160691123600
25 45324878456036464
26 226624392280182320