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A365469 Number of n X n nonnegative integer arrays with upper left entry 0, lower right entry n - 6, every value within 5 of its king-move distance from the upper left, and every value increasing by 0 or 1 with every step right, diagonally southeast, or down. 0

%I #20 Sep 05 2023 16:56:15

%S 0,0,0,0,0,1,923,414638,141905658,44926520946,14490345222595,

%T 4982468227997168,1856518533812384105,750167381136816327009,

%U 326628155352701098746754,151933161224857150407326456,74864085012461648054019799968,38785037369022058785365519932029

%N Number of n X n nonnegative integer arrays with upper left entry 0, lower right entry n - 6, every value within 5 of its king-move distance from the upper left, and every value increasing by 0 or 1 with every step right, diagonally southeast, or down.

%H Robert Dougherty-Bliss and Manuel Kauers, <a href="https://arxiv.org/abs/2309.00487">Hardinian Arrays</a>, arXiv:2309.00487 [math.CO], 2023.

%F Conjecture: a(n) ~ (2^4 / (3^23 * Pi^2)) * 1024^n / n^10.

%e Example for n = 8:

%e 00011112

%e 11111122

%e 22222222

%e 22222222

%e 22222222

%e 22222222

%e 22222222

%e 22222222

%Y Cf. A253026, A253217, A252998.

%K nonn

%O 1,7

%A _Robert Dougherty-Bliss_, Sep 04 2023

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Last modified August 12 19:26 EDT 2024. Contains 375113 sequences. (Running on oeis4.)