# A249793 (b-file synthesized from sequence entry)
0 1
1 1
2 7
3 35
4 171
5 856
6 4359
7 22446
8 116557
9 609289
10 3202088
11 16902558
12 89550391
13 475922764
14 2536113322
15 13545996260
16 72500109601
17 388730700761
18 2087639484747
19 11227578293407
20 60461487361452
21 325972272495485
22 1759323533735344
23 9504604121313715
24 51393787321667969
25 278127959744155754