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.

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A208397 Number of 6Xn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

Original entry on oeis.org

122, 88574, 53466192, 33085555344, 20413586117376, 12599441934740388, 7776176148498498768, 4799354153334997638528, 2962097148583259021121408, 1828166808374593843302307296, 1128320137401532221612440868480
Offset: 1

Views

Author

R. H. Hardin Feb 25 2012

Keywords

Comments

Row 6 of A208392

Examples

			Some solutions for n=4
..0..0..1..0....0..0..0..1....0..1..2..1....0..0..0..0....0..0..1..2
..1..1..0..0....1..2..2..1....2..0..0..1....0..1..1..2....2..2..1..0
..2..0..1..0....2..0..1..1....0..2..0..1....0..1..2..1....0..1..2..1
..0..1..1..0....2..1..2..0....2..0..1..0....2..2..0..0....0..1..0..0
..0..1..0..2....1..2..0..1....0..2..1..1....0..2..2..0....2..2..0..0
..2..2..0..1....1..2..0..2....2..0..0..1....0..1..0..1....0..1..0..2
		

Formula

Empirical: a(n) = 483*a(n-1) +79374*a(n-2) +2325758*a(n-3) -116482840*a(n-4) -4495564268*a(n-5) +111405792720*a(n-6) +2919342926960*a(n-7) -84278449377440*a(n-8) -292603254712096*a(n-9) +29279534769068608*a(n-10) -369555641966430528*a(n-11) +1674749264072678656*a(n-12) +2156486801391239424*a(n-13) -44057404748132724736*a(n-14) +72097583624114731008*a(n-15) +455663058958407811072*a(n-16) -1247507020751283224576*a(n-17) -3007043688407624581120*a(n-18) +9354958262137561546752*a(n-19) +16366237761751490756608*a(n-20) -38560165649886912446464*a(n-21) -74672497584369523752960*a(n-22) +72558930328852457586688*a(n-23) +224968833273366480683008*a(n-24) +41691604839132475424768*a(n-25) -285907224003663252946944*a(n-26) -313784969927732142014464*a(n-27) -101581793844321214005248*a(n-28) +27613799564794291814400*a(n-29) +24843347713795943301120*a(n-30) +2744862767351536287744*a(n-31) -1217400666371817209856*a(n-32) -239668061369775685632*a(n-33) for n>37

A208398 Number of 7Xn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

Original entry on oeis.org

365, 797162, 1390120992, 2498731184736, 4475009970818208, 8017919094401985204, 14365030966055594634024, 25736775141284073785898360, 46110664957128119185431178656, 82613053824261956541689461407504
Offset: 1

Views

Author

R. H. Hardin Feb 25 2012

Keywords

Comments

Row 7 of A208392

Examples

			Some solutions for n=4
..0..0..1..0....0..0..0..0....0..1..0..2....0..1..1..2....0..0..0..0
..0..1..2..1....0..1..0..2....1..2..2..1....0..1..2..1....1..1..1..2
..0..1..0..0....2..0..1..2....1..0..1..1....2..2..0..0....0..1..2..0
..2..2..0..0....0..2..1..0....0..0..2..0....0..2..2..0....2..1..1..1
..0..1..0..2....2..1..2..1....0..2..0..0....0..1..0..1....2..2..1..0
..1..1..1..2....2..2..1..2....0..1..2..0....1..2..2..2....0..0..2..1
..0..2..2..0....0..2..2..2....1..2..2..0....1..2..0..2....2..1..2..0
		
Previous Showing 11-12 of 12 results.