# A006111 (b-file synthesized from sequence entry)
2 1
3 31
4 806
5 20306
6 508431
7 12714681
8 317886556
9 7947261556
10 198682027181
11 4967053120931
12 124176340230306
13 3104408566792806
14 77610214474995931
15 1940255363400777181
16 48506384092648824056
17 1212659602354367574056
18 30316490059049924214681