# A037131 (b-file synthesized from sequence entry)
0 0
1 1
2 6
3 28
4 120
5 497
6 2016
7 8140
8 32640
9 130813
10 523776
11 2096133
12 8386580
13 33550335
14 134209524
15 536854528
16 2147450887
17 8589869054
18 34359607310
19 137438691321
20 549755289604
21 2199022206975
22 8796090925052
23 35184367894531
24 140737479966709
25 562949936644106