# A024334 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 -3
4 11
5 -50
6 214
7 -504
8 -6252
9 162576
10 -2754684
11 42663060
12 -650722260
13 10034523720
14 -158078985000
15 2553082867440
16 -42265263885600
17 715134876153600
18 -12299306666944560
19 213041497002431760
20 -3658374963886842000
21 60422495064228108000