# A149153 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 9
4 38
5 120
6 514
7 1787
8 8042
9 30024
10 137224
11 530796
12 2480856
13 9918516
14 46702784
15 190374471
16 906997854
17 3769136982
18 18033009962
19 75864970010
20 365546041018
21 1557303595620
22 7524069805854
23 32328005954926
24 156919659652734
25 680199365173406
26 3307922174834418
27 14428871521016760
28 70397383520857038