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!)
A203657 Number of (n+1)X2 0..7 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing 1
1212, 27966, 557544, 9592248, 146861704, 2050339423, 26569429480, 323824032048, 3749613354500, 41576091707436, 444241382108136, 4597646074173360, 46283153123300304, 454783873288441005, 4374858039450660168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A203661

LINKS

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

FORMULA

Empirical: a(n) = 70*a(n-1) -2275*a(n-2) +45612*a(n-3) -632289*a(n-4) +6438138*a(n-5) -49938467*a(n-6) +302065016*a(n-7) -1446908771*a(n-8) +5543625850*a(n-9) -17090839633*a(n-10) +42516502924*a(n-11) -85337511267*a(n-12) +137796276966*a(n-13) -177910179993*a(n-14) +181835622416*a(n-15) -144879499352*a(n-16) +87918207776*a(n-17) -39188297232*a(n-18) +12080293632*a(n-19) -2298481920*a(n-20) +203212800*a(n-21)

EXAMPLE

Some solutions for n=5

..6..1....1..1....7..2....0..5....0..2....5..2....2..3....7..7....6..6....0..3

..1..6....3..3....2..7....2..3....5..3....1..6....2..7....7..7....5..7....3..4

..2..5....4..4....2..7....7..0....5..7....7..2....5..4....7..7....5..7....5..2

..3..4....5..5....2..7....0..7....5..7....2..7....2..7....7..7....5..7....5..2

..0..7....6..7....3..6....3..4....5..7....2..7....7..2....7..7....7..5....1..6

..1..6....6..7....4..5....2..5....5..7....5..4....7..5....7..7....5..7....0..7

CROSSREFS

Sequence in context: A204339 A204332 A203661 * A250159 A184464 A204331

Adjacent sequences:  A203654 A203655 A203656 * A203658 A203659 A203660

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2012

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 November 26 21:07 EST 2021. Contains 349344 sequences. (Running on oeis4.)