This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A297901 Number of n X 2 0..1 arrays with every element equal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero. 6
 2, 4, 3, 13, 34, 73, 203, 594, 1443, 4013, 11114, 29073, 79243, 216234, 577883, 1566413, 4247794, 11437273, 30940683, 83723074, 225989523, 610970413, 1651964474, 4462848673, 12062978123, 32607525914, 88115865163, 238159441613 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A297907. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) + 3*a(n-2) + 8*a(n-3) - 4*a(n-4) - 16*a(n-5) for n>6. Empirical g.f.: x*(1 + 2*x)*(2 - 2*x - 3*x^2 - 12*x^3 + 12*x^4) / (1 - x - 3*x^2 - 8*x^3 + 4*x^4 + 16*x^5). - Colin Barker, Feb 19 2018 EXAMPLE Some solutions for n=7: ..0..1. .0..1. .0..1. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1. .0..1 ..1..0. .1..0. .1..0. .0..1. .0..0. .1..1. .0..1. .1..1. .0..1. .0..1 ..0..0. .1..1. .0..0. .0..0. .1..0. .1..1. .0..0. .1..1. .1..1. .0..0 ..1..0. .1..0. .1..0. .0..1. .0..1. .1..0. .0..0. .0..0. .1..0. .0..0 ..0..1. .0..1. .0..0. .0..0. .0..0. .1..0. .0..1. .1..1. .1..1. .1..1 ..0..0. .1..1. .1..0. .0..1. .0..1. .0..0. .0..0. .1..1. .0..1. .0..0 ..0..0. .1..1. .1..0. .0..1. .0..1. .0..0. .0..0. .0..0. .0..1. .0..0 CROSSREFS Cf. A297907. Sequence in context: A257503 A091861 A200715 * A079308 A189825 A271878 Adjacent sequences:  A297898 A297899 A297900 * A297902 A297903 A297904 KEYWORD nonn AUTHOR R. H. Hardin, Jan 08 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 16 01:43 EST 2019. Contains 330013 sequences. (Running on oeis4.)