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A058805 Number of labeled vertically indecomposable lattices with a fixed top and bottom. 2
1, 1, 1, 0, 1, 7, 97, 1981, 56611, 2151857, 104905809, 6375234313, 472007532691, 41778412444165, 4351370158008721, 526176012328671173, 73022861716667028531, 11515387009980686269561 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

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

Sequence in context: A083083 A022007 A174516 * A305137 A132061 A013521

Adjacent sequences:  A058802 A058803 A058804 * A058806 A058807 A058808

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Dec 28 2000

STATUS

approved

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Last modified July 15 23:32 EDT 2020. Contains 335774 sequences. (Running on oeis4.)