login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A264615 Irregular triangle read by rows: T(n,k) = number of signed unichromosonal genomes with n genes at 3-break distance k from a fixed genome, 0 <= k <= floor(n/2). 3
1, 1, 1, 1, 7, 1, 22, 25, 1, 50, 333, 1, 95, 1851, 1893, 1, 161, 6839, 39079, 1, 252, 19782, 323580, 301505, 1, 372, 48510, 1706180, 8566857, 1, 525, 105546, 6792650, 95942613, 82953225, 1, 715, 209682, 22248446, 668057885, 3025374471, 1, 946, 387783, 63055388, 3435912383, 43154349714, 35095900185 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..48.

N. Alexeev, A. Pologova, M. A. Alekseyev, Generalized Hultman Numbers and Cycle Structures of Breakpoint Graphs, Journal of Computational Biology 24:2 (2017), 93-105. doi:10.1089/cmb.2016.0190 arXiv:1503.05285

EXAMPLE

Triangle begins:

1,

1,1,

1,7,

1,22,25,

1,50,333,

1,95,1851,1893,

1,161,6839,39079,

1,252,19782,323580,301505,

1,372,48510,1706180,8566857,

...

CROSSREFS

Cf. A164652, A189507, A264614,  A264616, A264617.

Sequence in context: A050310 A178445 A019431 * A261248 A214686 A211790

Adjacent sequences:  A264612 A264613 A264614 * A264616 A264617 A264618

KEYWORD

nonn,tabf

AUTHOR

N. J. A. Sloane, Nov 28 2015

EXTENSIONS

Extended and offset corrected by Max Alekseyev, Feb 13 2018

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 June 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)