The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A143061 Triangle read by rows, A000012 * A127647 * A000012. 4

%I #21 Nov 26 2016 11:36:53

%S 1,1,2,2,3,4,3,5,6,7,5,8,10,11,12,8,13,16,18,19,20,13,21,26,29,31,32,

%T 33,21,34,42,47,50,52,53,54,34,55,68,76,81,84,86,87,88,55,89,110,123,

%U 131,136,139,141,142,143,89,144,178,199,212,220,225,228,230,231

%N Triangle read by rows, A000012 * A127647 * A000012.

%C Row sums = A014286 (1, 3, 9, 21, 46, 94, ...); left border = Fibonacci numbers.

%H Robert Israel, <a href="/A143061/b143061.txt">Table of n, a(n) for n = 1..10011</a> (rows 1 to 141, flattened)

%F From _Robert Israel_, Nov 06 2016: (Start)

%F T(n,k) = A000045(n+2) - A000045(n+2-k) for 1 <= k <= n.

%F G.f. as triangle: x*y*(1+x^2*y)/((1-x*y)*(1-x-x^2)*(1-x*y-x^2*y^2)). (End)

%e First few rows of the triangle are:

%e 1;

%e 1, 2;

%e 2, 3, 4;

%e 3, 5, 6, 7;

%e 5, 8, 10, 11, 12;

%e 8, 13, 16, 18, 19, 20;

%e ...

%p seq(seq(combinat:-fibonacci(i+2)-combinat:-fibonacci(i+2-j),j=1..i),i=1..20); # _Robert Israel_, Nov 06 2016

%Y Cf. A000012, A000045, A014286, A127647.

%K nonn,tabl

%O 1,3

%A _Gary W. Adamson_, Jul 20 2008

%E Corrected by _Dintle N Kagiso_, Nov 06 2016

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 May 27 16:21 EDT 2024. Contains 372880 sequences. (Running on oeis4.)