# A151420 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 9
5 20
6 60
7 196
8 589
9 1907
10 6516
11 21860
12 75589
13 267566
14 950279
15 3423629
16 12499661
17 45919855
18 170274916
19 636617648
20 2394733039
21 9067049073
22 34535991913
23 132213431523
24 508684283599
25 1966124324293
26 7630970742790
27 29734868078582
28 116292627615997
29 456375717434690
30 1796789652244346