The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A318539 Number of n X n 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
 1, 1, 6, 31, 247, 2905, 46165, 1143583, 41368803, 2165406865, 168220637918, 19176703676628, 3204799103321623, 788247777299643666, 284810105663632654341, 151134158955831615046217 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A318545. LINKS R. H. Hardin, Table of n, a(n) for n = 1..21 EXAMPLE Some solutions for n=5 ..0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0. .0..0..0..0..0 ..0..0..0..0..0. .1..0..0..0..0. .0..0..1..0..0. .0..0..0..1..0 ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0 ..0..1..0..0..1. .0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..1 ..0..0..0..0..0. .0..0..0..1..0. .0..0..0..1..0. .0..0..0..0..0 CROSSREFS Cf. A318545. Sequence in context: A244255 A299550 A208594 * A221514 A144576 A120107 Adjacent sequences:  A318536 A318537 A318538 * A318540 A318541 A318542 KEYWORD nonn AUTHOR R. H. Hardin, Aug 28 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 May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)