# A014970 (b-file synthesized from sequence entry)
0 1
1 12
2 72
3 304
4 1056
5 3240
6 9056
7 23520
8 57600
9 134332
10 300528
11 648720
12 1357184
13 2761800
14 5482944
15 10645664
16 20256768
17 37842264
18 69511272
19 125712624
20 224104896
21 394198912
22 684799776
23 1175834016
24 1996991488