# A277406 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 76
4 1100
5 25176
6 846132
7 39321696
8 2413753344
9 189030205440
10 18383301319680
11 2172771551093760
12 306662748175330560
13 50933260598106862080
14 9832247390118248121600
15 2182733403365330313523200
16 552134185815355910465126400
17 157863713952139655599757721600
18 50654908373638564216229105664000