# A027121 (b-file synthesized from sequence entry)
2 1
3 4
4 13
5 40
6 120
7 352
8 1022
9 2948
10 8473
11 24304
12 69649
13 199544
14 571795
15 1639244
16 4702499
17 13500396
18 38790727
19 111555296
20 321100627
21 925086012
22 2667533646
23 7698716068
24 22238169212
25 64289860528
26 186010834243
27 538611262492