# A294351 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 72
4 1512
5 74088
6 8446032
7 2238198480
8 1376492065200
9 1957371716714400
10 6404520257089516800
11 47989070286371749382400
12 820133211194093196945216000
13 31862175254890520701321641600000
14 2805942463821933705561890367504000000