# A020540 (b-file synthesized from sequence entry)
0 4
1 56
2 496
3 4064
4 32704
5 262016
6 2096896
7 16776704
8 134216704
9 1073739776
10 8589930496
11 68719468544
12 549755797504
13 4398046478336
14 35184372023296
15 281474976579584
16 2251799813423104
17 18014398508957696
18 144115188074807296