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A233719 Number of (n+1) X (2+1) 0..7 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 26. 1
1820, 13588, 101644, 820524, 6622988, 54865696, 453172200, 3781440536, 31469076952, 263046916084, 2194845360332, 18351617350708, 153277905148612, 1281532280178872, 10708142862585556, 89521470426434732, 748155393971878436 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A233724.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 90

FORMULA

Empirical recurrence of order 90 (see link above).

EXAMPLE

Some solutions for n=3:

..6..6..2....2..2..2....1..4..1....3..5..3....5..4..4....5..2..5....3..1..4

..2..5..2....1..5..1....1..5..1....5..2..0....1..1..5....5..1..5....6..4..2

..4..7..4....4..5..2....2..5..2....3..5..2....5..2..5....4..4..4....4..7..4

..2..5..2....4..1..2....6..5..1....0..2..0....5..1..1....0..3..0....6..4..2

CROSSREFS

Sequence in context: A156636 A234660 A238030 * A174770 A218104 A171349

Adjacent sequences:  A233716 A233717 A233718 * A233720 A233721 A233722

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2013

STATUS

approved

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Last modified January 18 23:25 EST 2021. Contains 340262 sequences. (Running on oeis4.)