|
| |
|
|
A240760
|
|
T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4
|
|
7
|
|
|
|
2, 5, 2, 11, 6, 4, 25, 9, 12, 6, 57, 42, 19, 16, 8, 129, 124, 142, 24, 16, 14, 293, 474, 553, 348, 25, 35, 20, 665, 1440, 4112, 1750, 653, 35, 35, 30, 1509, 5239, 18373, 20657, 5325, 1809, 45, 36, 48, 3425, 16730, 131958, 149324, 77314, 21859, 3606, 76, 65, 70, 7773
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Table starts
..2..5..11....25......57......129.......293........665........1509.......3425
..2..6...9....42.....124......474......1440.......5239.......16730......58945
..4.12..19...142.....553.....4112.....18373.....131958......625820....4472258
..6.16..24...348....1750....20657....149324....1954881....16557694..232884150
..8.16..25...653....5325....77314....947937...21847993...336059014.9470457699
.14.35..35..1809...21859...500139...9748926..420731038.11098085704
.20.35..45..3606...66809..2319189..75889699.5873834148
.30.36..76..8307..222091.11311246.583512422
.48.65.117.20609..811643.62333325
.70.83.180.42658.2448916
|
|
|
LINKS
|
|
|
|
FORMULA
|
Empirical for column k:
k=1: a(n) = a(n-2) +2*a(n-3)
k=2: a(n) = 3*a(n-3) +a(n-5) -2*a(n-8) -4*a(n-9) -a(n-11) +2*a(n-14) for n>17
k=3: [order 76] for n>84
Empirical for row n:
n=1: a(n) = a(n-1) +2*a(n-2) +2*a(n-3)
|
|
|
EXAMPLE
|
Some solutions for n=4 k=4
..3..3..1..1....2..2..2..2....3..3..1..3....2..1..1..3....2..2..3..3
..2..0..2..3....3..3..1..1....2..0..0..2....3..3..0..2....3..1..0..2
..2..0..2..3....3..2..0..1....3..1..0..2....2..1..3..2....2..0..1..3
..2..0..0..2....2..0..2..2....3..1..0..2....2..0..1..2....2..0..1..3
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
