# A335819 (b-file synthesized from sequence entry)
0 1
1 3
2 12
3 54
4 270
5 1458
6 8424
7 51516
8 331452
9 2230740
10 15641424
11 113846472
12 857706408
13 6671592216
14 53465326560
15 440602852752
16 3727748253456
17 32332181692464
18 287111706003648
19 2607272929404000
20 24187186030419936
21 228997933855499808
22 2210786521482955392
23 21746223198911853504