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!)
A173475 Triangle T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = Product_{j=0..n} A051179(j), read by rows. 1

%I #8 Apr 26 2021 02:34:00

%S 1,1,1,1,5,1,1,85,85,1,1,21845,371365,21845,1,1,1431655765,

%T 6254904037285,6254904037285,1431655765,1,1,6148914691236517205,

%U 1760625833240390967011987365,452480839142780478522080752805,1760625833240390967011987365,6148914691236517205,1

%N Triangle T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = Product_{j=0..n} A051179(j), read by rows.

%H G. C. Greubel, <a href="/A173475/b173475.txt">Rows n = 0..10 of the triangle, flattened</a>

%F T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = Product_{j,0,n} A051179(j).

%e Triangle begins as:

%e 1;

%e 1, 1;

%e 1, 5, 1;

%e 1, 85, 85, 1;

%e 1, 21845, 371365, 21845, 1;

%e 1, 1431655765, 6254904037285, 6254904037285, 1431655765, 1;

%t c[n_]:= Product[2^(2^j) - 1, {j,0,n}];

%t T[n_, k_]:= c[n]/(c[k]*c[n-k]);

%t Table[T[n, k], {n,0,8}, {k,0,n}]//Flatten

%o (Sage)

%o @CachedFunction

%o def c(n): return product( 2^(2^j) -1 for j in (0..n) )

%o def T(n,k): return c(n)/(c(k)*c(n-k))

%o flatten([[T(n,k) for k in (0..n)] for n in (0..8)]) # _G. C. Greubel_, Apr 26 2021

%Y Cf. A051179.

%K nonn,tabl,less

%O 0,5

%A _Roger L. Bagula_, Feb 19 2010

%E Edited by _G. C. Greubel_, Apr 26 2021

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 1 01:13 EDT 2024. Contains 372143 sequences. (Running on oeis4.)