A006362 Antichains (or order ideals) in the poset 2*2*5*n or size of the distributive lattice J(2*2*5*n). (Formerly M5411)

1, 196, 11196, 307960, 5157098, 60112692, 530962446, 3764727340, 22326282261, 114158490576, 515063238810, 2087929609236, 7714649716552, 26285397502428, 83379798088110, 248202756212336, 697998155989501, 1864955619299196

Offset

0,2

References

J. Berman and P. Koehler, Cardinalities of finite distributive lattices, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), 103-124.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

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

J. Berman and P. Koehler, Cardinalities of finite distributive lattices, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), 103-124. [Annotated scanned copy]

G. Kreweras, Les préordres totaux compatibles avec un ordre partiel, Math. Sci. Humaines No. 53 (1976), 5-30.

Index entries for sequences related to posets.

Crossrefs

Cf. A000372, A056932, A006360, A006361, A056933, A056934, A056935, A056936, A056937.

Sequence in context: A285922 A285858 A203540 * A363176 A035834 A114761

Adjacent sequences: A006359 A006360 A006361 * A006363 A006364 A006365

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

More terms from Mitch Harris, Jul 16 2000

Status

approved