A056937 Number of antichains (or order ideals) in the poset 3*3*3*n or size of the distributive lattice J(3*3*3*n)

1, 980, 211250, 17792748, 781429368, 21238316210, 398925639186, 5585711269074, 61555624183223, 555895303974238, 4242859829536322, 28038281717424550, 163544036697306396, 855242362045150398

Offset

0,2

References

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

Links

Table of n, a(n) for n=0..13.

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

Index entries for sequences related to posets

Crossrefs

Cf. A000372, A006360, A006361, A006362, A056932, A056933, A056934, A056935, A056936.

Sequence in context: A188337 A109120 A128483 * A251839 A122472 A252402

Adjacent sequences: A056934 A056935 A056936 * A056938 A056939 A056940

Keyword

nonn,easy

Author

Mitch Harris

Status

approved