A270115 Number of n X 5 0..7 arrays with some element plus some horizontally or vertically adjacent neighbor totalling seven exactly once.

10976, 345422784, 5795977666752, 81224231406183600, 1043364062813432764992, 12729704731136074190860176, 150106896816846862603331679744, 1727666938750128431329666085123136

Offset

1,1

Comments

Column 5 of A270118.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 21508*a(n-1) -131769514*a(n-2) +177803696938*a(n-3) -113194471117013*a(n-4) +41072139293972644*a(n-5) -9009512737177947337*a(n-6) +1174299801076139330678*a(n-7) -78815033190830617996130*a(n-8) +815915154281354277564428*a(n-9) +198823102698530600164550375*a(n-10) -6554822747169941935810364140*a(n-11) -168760243259405706734550783268*a(n-12) +2476292267732260255354825180992*a(n-13) -7634283380068607665468225784064*a(n-14) for n > 15.

Example

Some solutions for n=1
..5..2..0..0..3. .6..1..3..5..0. .5..5..5..0..7. .1..6..7..3..0

Crossrefs

Cf. A270118.

Sequence in context: A035913 A124668 A270148 * A335082 A104323 A252039

Adjacent sequences: A270112 A270113 A270114 * A270116 A270117 A270118

Keyword

nonn

Author

R. H. Hardin, Mar 11 2016

Status

approved