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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A250910 Number of (n+1)X(5+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element 1
325277, 147178899, 66566704705, 30104106257115, 13614176466285177, 6156816533805174849, 2784331051704024117237, 1259173248324767358662925, 569442787308774307063155581, 257522216934259282355558842095 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A250913

LINKS

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

FORMULA

Empirical: a(n) = 620*a(n-1) -83627*a(n-2) +3605344*a(n-3) -42939846*a(n-4) -359947350*a(n-5) -21966661684*a(n-6) +497911964614*a(n-7) +513259039316*a(n-8) -10457703809577*a(n-9) -38142371891658*a(n-10) +587402536308610*a(n-11) -708344809484929*a(n-12) +2544659270637351*a(n-13) -21664799325067637*a(n-14) -42112417379573209*a(n-15) -236690631158164970*a(n-16) -4176670320833459964*a(n-17) -3656719896908549160*a(n-18) +2416174462811127841*a(n-19) +24326017200039318168*a(n-20) +17107585593966470060*a(n-21) -12080326048429290248*a(n-22) -18434081023517743400*a(n-23) -1896924959275875792*a(n-24) +6243621207481879936*a(n-25) +2258125750726765056*a(n-26) -358275665973080064*a(n-27) -370973105956454400*a(n-28) -15044183404314624*a(n-29) +22277901999144960*a(n-30)

EXAMPLE

Some solutions for n=1

..2..2..0..0..2..2....1..0..0..0..2..1....2..2..1..0..1..0....0..0..2..0..0..1

..2..0..2..2..2..0....1..0..2..2..2..2....0..1..1..0..1..0....2..0..1..2..0..2

CROSSREFS

Sequence in context: A263154 A186836 A237223 * A015360 A209847 A237306

Adjacent sequences:  A250907 A250908 A250909 * A250911 A250912 A250913

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 2014

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 26 16:30 EST 2021. Contains 340442 sequences. (Running on oeis4.)