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!)
A277636 Number of 3 X 3 matrices having all elements in {0,...,n} with determinant = permanent. 1
1, 343, 6859, 50653, 226981, 753571, 2048383, 4826809, 10218313, 19902511, 36264691, 62570773, 103161709, 163667323, 251239591, 374805361, 545338513, 776151559, 1083206683, 1485446221, 2005142581, 2668267603, 3504881359, 4549540393, 5841725401, 7426288351 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) is a perfect cube.

LINKS

Indranil Ghosh, Table of n, a(n) for n = 0..100

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

a(n) = A003215(n-1)^3.

a(n) = (3*n^2 - 3*n + 1)^3.

G.f.: (1 + 336*x + 4479*x^2 + 9808*x^3 + 4479*x^4 + 336*x^5 + x^6) / (1 - x)^7. - Colin Barker, Jan 02 2017

PROG

(Python)

def a(n):

    return 27*n**6-81*n**5+108*n**4-81*n**3+36*n**2-9*n+1

(PARI) Vec((1 + 336*x + 4479*x^2 + 9808*x^3 + 4479*x^4 + 336*x^5 + x^6) / (1 - x)^7 + O(x^30)) \\ Colin Barker, Jan 02 2017

CROSSREFS

Cf. A059976 (Number of 3 X 3 singular matrices with all elements in {0,...,n})

Cf. A015237 (Number of 2 X 2 matrices with all elements in {0,...,n} with determinant = permanent )

Cf. A003215.

Sequence in context: A167727 A017475 A017607 * A224427 A134263 A270820

Adjacent sequences:  A277633 A277634 A277635 * A277637 A277638 A277639

KEYWORD

nonn,easy

AUTHOR

Indranil Ghosh, Jan 02 2017

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 August 8 21:55 EDT 2022. Contains 356016 sequences. (Running on oeis4.)