# A004537 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 4600
4 93150
5 953856
6 6476800
7 32788800
8 133204500
9 458086400
10 1384998912
11 3771829800
12 9403968600
13 21771763200
14 47406643200
15 97917423808
16 192825064350
17 364086835200
18 663509299200
19 1171711866600