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A265924 Number of nX4 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique. 1
340, 9016, 72772, 542940, 4044156, 30029860, 225444912, 1691502456, 12779302796, 96726712256, 733594037948, 5585468980116, 42451575314372, 324411240385960, 2468510420444928, 18903703259295268, 143946266428000640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A265928.

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) +74*a(n-2) -2388*a(n-3) +3439*a(n-4) +135306*a(n-5) -522734*a(n-6) -3439014*a(n-7) +19923934*a(n-8) +36082640*a(n-9) -333465409*a(n-10) -59196434*a(n-11) +2436517719*a(n-12) +88992424*a(n-13) -9296733480*a(n-14) -4787400052*a(n-15) +15068783472*a(n-16) +20054756552*a(n-17) +3031868640*a(n-18) -14763124864*a(n-19) -19831398480*a(n-20) -12928318048*a(n-21) -3167850512*a(n-22) +1557170880*a(n-23) +1561396480*a(n-24) +555187200*a(n-25) +96018432*a(n-26) +6553600*a(n-27) -65536*a(n-28) for n>32

EXAMPLE

Some solutions for n=3

..0..0..4..4....4..0..1..3....4..2..1..3....1..3..3..2....0..0..1..3

..1..1..0..3....3..4..4..2....2..1..3..4....2..0..0..1....3..1..4..0

..3..0..1..4....2..1..3..3....4..0..0..1....4..4..3..0....2..4..3..1

CROSSREFS

Cf. A265928.

Sequence in context: A232514 A187383 A265969 * A239159 A222927 A298908

Adjacent sequences:  A265921 A265922 A265923 * A265925 A265926 A265927

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 18 2015

STATUS

approved

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Last modified December 5 00:21 EST 2021. Contains 349530 sequences. (Running on oeis4.)