# A145221 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 0
4 6
5 20
6 135
7 924
8 7420
9 66744
10 667485
11 7342280
12 88107426
13 1145396460
14 16035550531
15 240533257860
16 3848532125880
17 65425046139824
18 1177650830516985
19 22375365779822544
20 447507315596451070
21 9397653627525472260
22 206748379805560389951
23 4755212735527888968620