# A028270 (b-file synthesized from sequence entry)
0 1
1 3
2 8
3 26
4 90
5 322
6 1176
7 4356
8 16302
9 61490
10 233376
11 890188
12 3409588
13 13104756
14 50517200
15 195234120
16 756197910
17 2934686610
18 11408741520
19 44420399100
20 173191792620
21 676104403260
22 2642356838160
23 10337529691320
24 40481034410700