# A281157 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 25
4 78
5 258
6 800
7 2463
8 7344
9 21511
10 61677
11 173980
12 483319
13 1323470
14 3577605
15 9553658
16 25227727
17 65918419
18 170552866
19 437196640
20 1110945961
21 2799689792
22 7000246591
23 17372882671
24 42809388080
25 104774554942
26 254771953179
27 615667051237
28 1478934870484
29 3532347875968