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A275131 T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,0) or (-1,1) and new values introduced in order 0..2. 12
1, 2, 1, 5, 4, 2, 14, 16, 12, 4, 41, 64, 45, 36, 8, 122, 256, 174, 129, 108, 16, 365, 1024, 675, 568, 373, 324, 32, 1094, 4096, 2607, 2545, 2178, 1083, 972, 64, 3281, 16384, 10077, 11092, 12423, 8321, 3148, 2916, 128, 9842, 65536, 38967, 48451, 71576, 62378 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Table starts
...1.....2.....5......14.......41.......122.........365.........1094
...1.....4....16......64......256......1024........4096........16384
...2....12....45.....174......675......2607.......10077........38967
...4....36...129.....568.....2545.....11092.......48451.......212897
...8...108...373....2178....12423.....71576......412306......2381629
..16...324..1083....8321....62378....473185.....3586068.....27224209
..32...972..3148...31772...315021...3146574....31446544....315531602
..64..2916..9157..121707..1591442..20970214...276145917...3669759648
.128..8748.26623..466252..8024937.139845553..2432426709..42807577389
.256.26244.77372.1783920.40445177.930732169.21443562178.499213473864
LINKS
FORMULA
Empirical for column k:
k=1: a(n) = 2*a(n-1) for n>2
k=2: a(n) = 3*a(n-1) for n>2
k=3: [order 9] for n>10
k=4: [order 17] for n>20
k=5: [order 28] for n>31
k=6: [order 67] for n>70
Empirical for row n:
n=1: a(n) = 4*a(n-1) -3*a(n-2)
n=2: a(n) = 4*a(n-1)
n=3: a(n) = 3*a(n-1) +2*a(n-2) +6*a(n-3) -2*a(n-4) -4*a(n-5) for n>6
n=4: [order 9] for n>11
n=5: [order 10] for n>14
n=6: [order 26] for n>28
n=7: [order 53] for n>58
EXAMPLE
Some solutions for n=4 k=4
..0..0..1..1. .0..0..1..1. .0..1..2..2. .0..1..1..1. .0..0..1..2
..2..2..0..2. .2..2..2..0. .2..0..1..0. .2..2..0..0. .1..2..0..1
..1..1..1..1. .0..0..1..2. .1..2..2..2. .1..1..1..2. .0..1..2..2
..0..0..0..0. .2..2..0..0. .0..1..1..1. .2..2..0..1. .2..0..0..1
CROSSREFS
Column 1 is A000079(n-2).
Column 2 is A003946(n-1).
Row 1 is A007051(n-1).
Row 2 is A000302(n-1).
Sequence in context: A164678 A164679 A275183 * A280513 A185023 A061579
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Jul 17 2016
STATUS
approved

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Last modified March 28 08:19 EDT 2024. Contains 371236 sequences. (Running on oeis4.)