A281803 Number of 2 X n 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
0, 0, 6, 38, 157, 524, 1631, 4694, 13006, 34776, 90703, 231788, 582557, 1444328, 3539638, 8590070, 20670737, 49377196, 117193443, 276578138, 649454590, 1518211492, 3534848915, 8200472092, 18962152697, 43716887564, 100516988278
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..1..1..1. .0..0..0..0. .0..1..0..1. .0..1..0..0. .0..0..1..0 ..1..1..1..0. .1..1..0..1. .1..1..1..1. .0..0..1..0. .1..1..1..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A281802.
Formula
Empirical: a(n) = 7*a(n-1) -10*a(n-2) -29*a(n-3) +68*a(n-4) +67*a(n-5) -195*a(n-6) -108*a(n-7) +306*a(n-8) +132*a(n-9) -276*a(n-10) -96*a(n-11) +136*a(n-12) +32*a(n-13) -32*a(n-14).
Comments