A302274 Number of n X 4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

2, 10, 29, 89, 353, 941, 3316, 12016, 34060, 120940, 415304, 1257949, 4395268, 14710881, 46444038, 159674287, 528683443, 1709740974, 5804427370, 19154720511, 62771586925, 211230338251, 697032878924, 2300170434527, 7695594400341

Offset: 1

Author

R. H. Hardin, Apr 04 2018

Keywords

• nonn

Comments

Column 4 of A302278.

Examples

			Some solutions for n=5:
  0 0 1 1     0 1 0 1     0 0 1 0     0 0 1 0     0 1 1 1
  1 0 0 1     1 0 1 0     1 1 0 1     1 1 0 0     0 0 1 0
  0 1 0 1     1 0 1 0     1 0 1 0     0 1 0 0     0 0 0 0
  0 0 1 1     0 1 0 1     1 1 1 1     0 0 1 0     1 1 0 1
  0 0 1 1     0 0 0 0     0 0 0 0     0 0 1 1     0 0 1 0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 72

Crossrefs

Cf. A302278.

Formula

Empirical recurrence of order 72 (see link above)