login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A223957 Number of nX4 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing 3

%I #4 Mar 29 2013 21:41:21

%S 35,805,12311,176893,2575955,37844037,559416917,8299429418,

%T 123370738379,1835707326614,27327510542054,406907786331737,

%U 6059551623581467,90242115362238750,1343972755503334184,20016039213440972353

%N Number of nX4 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing

%C Column 4 of A223961

%H R. H. Hardin, <a href="/A223957/b223957.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 35*a(n-1) -411*a(n-2) +1521*a(n-3) +4495*a(n-4) -33893*a(n-5) -76333*a(n-6) +769422*a(n-7) -657978*a(n-8) -4892638*a(n-9) +11892141*a(n-10) +26545075*a(n-11) -212154687*a(n-12) +180127811*a(n-13) +844199306*a(n-14) -1964869675*a(n-15) -925267902*a(n-16) +18361374116*a(n-17) -28421809002*a(n-18) +14606204778*a(n-19) +43447425250*a(n-20) +45550238994*a(n-21) -206541843216*a(n-22) +420735920152*a(n-23) +123206624124*a(n-24) -263534650788*a(n-25) -263768865528*a(n-26) +1543560996888*a(n-27) +154734998544*a(n-28) -494508716208*a(n-29) -124707094560*a(n-30) +893424774528*a(n-31) +244581703200*a(n-32) +20427292800*a(n-33) +536699520*a(n-34) for n>36

%e Some solutions for n=3

%e ..0..0..0..2....0..2..2..2....1..2..2..3....0..0..1..1....0..0..1..3

%e ..0..0..1..3....0..1..2..3....0..2..2..3....1..1..3..3....0..1..1..3

%e ..0..1..2..3....0..3..3..3....0..2..2..3....0..3..3..3....0..1..3..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 29 2013

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 18 15:48 EDT 2024. Contains 371780 sequences. (Running on oeis4.)