# A216491 (b-file synthesized from sequence entry)
0 12
1 60
2 300
3 1500
4 7500
5 37500
6 187500
7 937500
8 4687500
9 23437500
10 117187500
11 585937500
12 2929687500
13 14648437500
14 73242187500
15 366210937500
16 1831054687500
17 9155273437500
18 45776367187500
19 228881835937500
20 1144409179687500
21 5722045898437500
22 28610229492187500