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A270855 Number of 6 X 6 X 6 triangular 0..n arrays with some element plus some adjacent element totalling n+1, n or n-1 exactly once. 1

%I

%S 0,0,28440,27582438,5805948474,571228600932,29999932959600,

%T 1131964246928502,27738553460278170,526704152938743948,

%U 7209576736148583840,80085435443327098104,700902167873486650002

%N Number of 6 X 6 X 6 triangular 0..n arrays with some element plus some adjacent element totalling n+1, n or n-1 exactly once.

%C Row 6 of A270850.

%H R. H. Hardin, <a href="/A270855/b270855.txt">Table of n, a(n) for n = 1..15</a>

%e Some solutions for n=3

%e .......0............2............3............3............3............1

%e ......0.1..........3.3..........3.3..........3.3..........3.2..........0.0

%e .....0.0.1........2.3.3........3.3.2........3.3.3........2.3.3........0.0.1

%e ....0.0.0.0......3.3.3.2......3.2.3.3......3.3.3.2......3.3.3.3......0.0.0.0

%e ...0.0.0.0.1....3.2.3.3.3....3.3.3.3.2....3.3.3.3.3....3.3.3.2.2....0.0.0.1.0

%e ..0.0.0.1.0.0..2.3.3.3.2.2..2.3.2.3.2.3..3.3.3.3.2.2..2.3.2.3.3.3..1.0.0.1.0.0

%Y Cf. A270850.

%K nonn

%O 1,3

%A _R. H. Hardin_, Mar 24 2016

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Last modified January 20 01:01 EST 2022. Contains 350467 sequences. (Running on oeis4.)