A204567 - OEIS

A204567

Number of (n+1)X4 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order

256, 6112, 158981, 4220392, 112592256, 3007468553, 80358249724, 2147311723128, 57381098807117, 1533363080745712, 40975264290787104, 1094961088264570145, 29260089513854569828, 781902543548899924344, 20894385553758379097861

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OFFSET

1,1

COMMENTS

Column 3 of A204572

LINKS

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

FORMULA

Empirical: a(n) = 41*a(n-1) -451*a(n-2) +2007*a(n-3) -4185*a(n-4) +4371*a(n-5) -2214*a(n-6) +432*a(n-7)

EXAMPLE

Some solutions for n=4

..0..0..0..1....0..0..0..0....0..1..1..0....0..0..1..0....0..0..0..0