# A268600 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 12
4 36
5 132
6 456
7 1752
8 6340
9 24660
10 91224
11 356776
12 1337896
13 5250728
14 19877904
15 78209712
16 298176516
17 1175437428
18 4505865144
19 17789574792
20 68490100536
21 270739425528
22 1046041377264
23 4139198745552
24 16039426479336
25 63522770785032
26 246761907761776
27 977995685565072
28 3807202080396240
29 15098691607042000
30 58884954519908896