# A135373 (b-file synthesized from sequence entry)
0 1
1 4
2 12
3 34
4 78
5 180
6 408
7 900
8 2052
9 4490
10 9702
11 21010
12 45144
13 96486
14 205590
15 435548
16 920896
17 1938594
18 4072946
19 8535970
20 17845982
21 37242540
22 77569570
23 161300102
24 334906956
25 694329000
26 1437620932
27 2972973918
28 6141189354
29 12672042908
30 26122458858
31 53799031890