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A270850 T(n,k)=Number of nXnXn triangular 0..k arrays with some element plus some adjacent element totalling k+1, k or k-1 exactly once. 12
0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 24, 30, 0, 0, 0, 66, 270, 252, 0, 0, 0, 120, 1650, 6822, 2298, 0, 0, 0, 198, 7344, 108348, 307494, 28440, 0, 0, 0, 288, 24954, 1144464, 15754872, 27582438, 460494, 0, 0, 0, 402, 68838, 8559378, 469037376, 5805948474, 4875050400 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,8
COMMENTS
Table starts
.0.0......0..........0.............0................0..................0
.0.0......6.........24............66..............120................198
.0.0.....30........270..........1650.............7344..............24954
.0.0....252.......6822........108348..........1144464............8559378
.0.0...2298.....307494......15754872........469037376.........8746813158
.0.0..28440...27582438....5805948474.....571228600932.....29999932959600
.0.0.460494.4875050400.5281372355106.2104222937252028.358240737864481086
LINKS
FORMULA
Empirical for row n:
n=1: a(n) = a(n-1)
n=2: a(n) = 2*a(n-1) -2*a(n-3) +a(n-4) for n>5
n=3: [order 10] for n>17
n=4: [order 18] for n>33
Empirical quasipolynomials for row n:
n=2: polynomial of degree 2 plus a quasipolynomial of degree 0 with period 2 for n>1
n=3: polynomial of degree 5 plus a quasipolynomial of degree 3 with period 2 for n>7
n=4: polynomial of degree 9 plus a quasipolynomial of degree 7 with period 2 for n>15
EXAMPLE
Some solutions for n=4 k=4
.....3........0........4........3........2........3........0........0
....4.3......0.1......4.4......4.4......4.4......4.4......0.0......1.2
...4.2.4....1.0.1....2.4.3....3.3.3....3.4.4....2.4.4....0.0.0....1.0.0
..3.4.4.3..2.0.1.0..4.2.4.3..2.4.4.3..4.2.4.2..0.4.4.2..2.1.0.2..0.1.1.1
CROSSREFS
Sequence in context: A308091 A096527 A028599 * A322379 A225339 A365989
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Mar 24 2016
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)