login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A334159 Irregular triangle read by rows: T(n,k) is the number of colorings of the n-hypercube graph using exactly k unlabeled colors, k = 1..2^n. 9
1, 0, 1, 0, 1, 2, 1, 0, 1, 18, 92, 146, 80, 16, 1, 0, 1, 494, 54583, 1507094, 12630906, 40096740, 58031885, 43419502, 18212138, 4498756, 670366, 60220, 3156, 88, 1, 0, 1, 197546, 5427041958, 17973998149410, 10961517110194516, 1450479305675145412, 56507865332978414188 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..62 (rows 0..5)

Andrew Howroyd, Chromatic Polynomials of Hypercubes Q_0 to Q_5

Eric Weisstein's World of Mathematics, Chromatic Polynomial

Eric Weisstein's World of Mathematics, Hypercube Graph

EXAMPLE

Triangle begins:

0 | 1;

1 | 0, 1;

2 | 0, 1, 2, 1;

3 | 0, 1, 18, 92, 146, 80, 16, 1;

4 | 0, 1, 494, 54583, 1507094, 12630906, 40096740, 58031885, 43419502, 18212138, 4498756, 670366, 60220, 3156, 88, 1;

CROSSREFS

Cf. A091940, A140986, A158348, A296914, A295176, A334247.

Sequence in context: A331278 A266632 A062154 * A326474 A266886 A267546

Adjacent sequences:  A334156 A334157 A334158 * A334160 A334161 A334162

KEYWORD

nonn,tabf

AUTHOR

Andrew Howroyd, Apr 21 2020

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 14 00:42 EDT 2021. Contains 342941 sequences. (Running on oeis4.)