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Number of labeled vertically indecomposable lattices with a fixed top and bottom.
2

%I #3 Mar 30 2012 17:37:12

%S 1,1,1,0,1,7,97,1981,56611,2151857,104905809,6375234313,472007532691,

%T 41778412444165,4351370158008721,526176012328671173,

%U 73022861716667028531,11515387009980686269561

%N Number of labeled vertically indecomposable lattices with a fixed top and bottom.

%Y a(n)=A058803(n)/(n*(n-1))=A058804(n)/(n-1).

%K nonn,hard

%O 0,6

%A _Christian G. Bower_, Dec 28 2000