cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A183317 Number of nX5 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

Original entry on oeis.org

13, 57, 377, 1975, 11385, 61755, 343035, 1872913, 10288475, 56225061, 307755285, 1681755047, 9194060283, 50235380141, 274514218163, 1499800424044, 8194423899045, 44768307376625, 244584423489933, 1336207363455509
Offset: 1

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Author

R. H. Hardin Jan 03 2011

Keywords

Comments

Column 5 of A183322

Examples

			Some solutions for 5X5
..0..0..1..1..0....1..1..0..0..0....0..0..0..0..0....0..0..0..0..1
..0..0..1..1..1....1..1..0..0..0....0..0..1..1..1....0..0..0..1..1
..0..0..0..0..1....0..0..0..0..0....0..0..1..1..1....0..0..0..1..1
..0..1..1..0..0....0..0..0..1..1....0..1..1..0..1....1..1..0..0..1
..0..1..1..0..1....0..0..0..1..1....1..1..1..1..1....1..1..0..1..1
		

Formula

Empirical: a(n)=a(n-1)+61*a(n-2)-29*a(n-3)-1491*a(n-4)+297*a(n-5)+19701*a(n-6)-1185*a(n-7)-159127*a(n-8)-819*a(n-9)+836109*a(n-10)+27171*a(n-11)-2951431*a(n-12)-125221*a(n-13)+7095801*a(n-14)+329665*a(n-15)-11617381*a(n-16)-586437*a(n-17)+12793417*a(n-18)+723297*a(n-19)-9246383*a(n-20)-590475*a(n-21)+4223841*a(n-22)+294743*a(n-23)-1155939*a(n-24)-81687*a(n-25)+173913*a(n-26)+10715*a(n-27)-12215*a(n-28)-423*a(n-29)+281*a(n-30)-a(n-31)-a(n-32)