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Number of permutations of n copies of 1..9 introduced in order 1..9 with no element equal to another within a distance of 1.
8

%I #15 Nov 10 2024 21:46:23

%S 1,12310199,372419001449076,16904301142107043464659,

%T 967335448974819561548523580438,

%U 64311863997340571475504065539218471107,4749303210651587675797285013227098386984170468,379065045836307787068046364731543393514652159389593652

%N Number of permutations of n copies of 1..9 introduced in order 1..9 with no element equal to another within a distance of 1.

%H Seiichi Manyama, <a href="/A321987/b321987.txt">Table of n, a(n) for n = 1..100</a>

%F a(n) ~ 2187 * 2^(27*n-14) / (84035 * Pi^4 * n^4). - _Vaclav Kotesovec_, Nov 24 2018

%Y Column k=9 of A322013.

%Y Cf. A000012, A190917, A190918, A190920, A190923, A190927, A190932.

%K nonn

%O 1,2

%A _Seiichi Manyama_, Nov 23 2018