A079507 - OEIS

A079507

Triangle T(n,k) read by rows; related to number of preorders.

1, 1, 4, 4, 1, 15, 63, 96, 48, 1, 44, 468, 1936, 3688, 3264, 1088, 1, 120, 2795, 23990, 98275, 214640, 256720, 158720, 39680

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Row n has 2n-1 entries.

LINKS

G. Kreweras, Les préordres totaux compatibles avec un ordre partiel, Math. Sci. Humaines No. 53 (1976), 5-30. (The array on page 22.)

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

FORMULA

How is this array defined?

EXAMPLE

1; 1,4,4; 1,15,63,96,48; ...

CROSSREFS

KEYWORD

nonn,tabf,more

AUTHOR

STATUS

approved