# A002978 (b-file synthesized from sequence entry)
1 0
2 0
3 4
4 0
5 12
6 8
7 48
8 96
9 320
10 888
11 2748
12 8384
13 26340
14 83568
15 268864
16 873648
17 2865216
18 9470784
19 31525524
20 105594912
21 355673804
22 1204059144
23 4094727168
24 13983145888
25 47932777680
26 164881688088
27 568990371212
28 1969356192624
29 6834965581764
30 23782468159920