# A071910 (b-file synthesized from sequence entry)
0 0
1 18
2 180
3 900
4 3150
5 8820
6 21168
7 45360
8 89100
9 163350
10 283140
11 468468
12 745290
13 1146600
14 1713600
15 2496960
16 3558168
17 4970970
18 6822900
19 9216900
20 12273030
21 16130268
22 20948400
23 26910000
24 34222500
25 43120350
26 53867268
27 66758580
28 82123650
29 100328400
30 121777920