# A117615 (b-file synthesized from sequence entry)
0 0
1 1
2 4
3 18
4 72
5 290
6 1160
7 4642
8 18568
9 74274
10 297096
11 1188386
12 4753544
13 19014178
14 76056712
15 304226850
16 1216907400
17 4867629602
18 19470518408
19 77882073634
20 311528294536
21 1246113178146
22 4984452712584
23 19937810850338
24 79751243401352