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A292102 Irregular triangle read by rows: T(n,k) (n >= 3) is the cardinality of the subsemilattice S(n,k) of the Bipartition lattice Bip(n). 0
24, 21, 158, 142, 1320, 1202, 1198, 13348, 12304, 12246 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..12.

L. Santocanale, F. Wehrung, G. Grätzer, F. Wehrung, Generalizations of the Permutohedron, in Grätzer G., Wehrung F. (eds) Lattice Theory: Special Topics and Applications. Birkhäuser, Cham, pp. 287-397.

EXAMPLE

card S(3, 0) = 24 ; card S(3, 1) = 21 .

card S(4, 0) = 158 ; card S(4, 1) = 142 .

card S(5, 0) = 1,320 ; card S(5, 1) = 1,202 ; card S(5, 2) = 1,198 .

card S(6, 0) = 13,348 ; card S(6, 1) = 12,304 ; card S(6, 2) = 12,246 .

CROSSREFS

Sequence in context: A153729 A128560 A230340 * A022980 A023466 A278656

Adjacent sequences:  A292099 A292100 A292101 * A292103 A292104 A292105

KEYWORD

nonn,tabf,more

AUTHOR

N. J. A. Sloane, Sep 13 2017

STATUS

approved

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Last modified September 20 17:41 EDT 2021. Contains 347586 sequences. (Running on oeis4.)