# A373568 (b-file synthesized from sequence entry) 0 1 1 5 2 10 3 30 4 85 5 246 6 707 7 2037 8 5864 9 16886 10 48620 11 139997 12 403104 13 1160693 14 3342081 15 9623140 16 27708726 17 79784098 18 229729153 19 661478734 20 1904652103 21 5484227157 22 15791202736 23 45468956106 24 130922641160 25 376976720745 26 1085461206128 27 3125460977225 28 8999406210929