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!)
A204444 Permanent of the n-th principal submatrix of A204443. 3
1, 1, 2, 9, 34, 140, 672, 4752, 32304, 230832, 1780704, 17927568, 175473216, 1780206336, 18988867584, 248341303296, 3173837230080, 41713375334400, 568818754560000, 9150176586240000, 144343174487040000, 2329812142295040000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
MATHEMATICA
f[i_, j_] := Floor[(i + j + 3)/4] - Floor[(i + j)/4];
m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
TableForm[m[8]] (* 8x8 principal submatrix *)
Flatten[Table[f[i, n + 1 - i],
{n, 1, 14}, {i, 1, n}]] (* A204443 *)
Permanent[m_] :=
With[{a = Array[x, Length[m]]},
Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 22}] (* A204444 *)
CROSSREFS
Sequence in context: A077234 A091526 A274750 * A204430 A150937 A150938
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 15 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)