# A024500 (b-file synthesized from sequence entry)
1 2
2 1
3 2
4 4
5 10
6 25
7 70
8 201
9 600
10 1847
11 5830
12 18778
13 61542
14 204676
15 689411
16 2347970
17 8074762
18 28009676
19 97909318
20 344616322
21 1220539397
22 4347311908
23 15564141262
24 55985423060
25 202256970300
26 733607297260
27 2670698800614
28 9755982909133