# A216733 (b-file synthesized from sequence entry)
1 1
2 4
3 54
4 1280
5 44500
6 2095632
7 127881376
8 9819500544
9 928097190000
10 106056995000000
11 14432021983025504
12 2308065337772034048
13 428863163196474895616
14 91656939861553564825600
15 22332165732277725605760000
16 6154560612828089005182025728
17 1905106896258617768240402396928
18 658221263587332244069472967367680
19 252407458471654722567803941053452800