A223424 5X5X5 triangular graph without horizontal edges coloring a rectangular array: number of n X n 0..14 arrays where 0..14 label nodes of a graph with edges 0,1 0,2 1,3 1,4 2,4 2,5 3,6 3,7 4,7 4,8 5,8 5,9 6,10 6,11 7,11 7,12 8,12 8,13 9,13 9,14 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph

15, 248, 25436, 14270468, 44494633876, 751323264058296, 69480486701806161900, 34690065037599351161239084, 94456106387833550741267252957732, 1387026638297370437542605944364720106044

Offset

1,1

Comments

Diagonal of A223432

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
..1..3..1....7..3..7....7.11..6....7..4..8...11..7..4....8..4..8...11..7.12
..3..7..3....3..7.12...12..7..3....3..1..4....7..4..1....4..2..5....6..3..7
..6..3..7....6.11..7....7.11..7....1..3..1....4..2..0....1..4..8....3..1..4

Crossrefs

Sequence in context: A163031 A065920 A273624 * A218806 A285395 A331493

Adjacent sequences: A223421 A223422 A223423 * A223425 A223426 A223427

Keyword

nonn

Author

R. H. Hardin Mar 20 2013

Status

approved