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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227961 Triangle T(n,k) read by rows: how often does k appear among the first A006116(n) entries of A198260? 2
2, 3, 2, 4, 8, 2, 2, 5, 22, 8, 24, 2, 2, 2, 2, 6, 52, 22, 150, 8, 24, 24, 72, 2, 2, 2, 2, 2, 2, 2, 2, 7, 114, 52, 740, 22, 150, 150, 1046, 8, 24, 24, 72, 24, 72, 72, 216, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 8, 240, 114, 3282, 52, 740 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

T(n,k) shows how often k appears among the first A006116(n) entries of A198260.

n and k are counted from 1:

2,

3,  2,

4,  8, 2,  2,

5, 22, 8, 24, 2,  2,  2,   2,

6, 52,22,150, 8, 24, 24,  72,2, 2, 2, 2, 2, 2, 2,  2,

7,114,52,740,22,150,150,1046,8,24,24,72,24,72,72,216,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2

The number of different entries per row is 1,2,3,5,8,12,16...

The second column 2,8,22,52,114,240... seems to appear in other columns as well.

Row lengths are powers of two (A000079).

Row sums are the sums of Gaussian binomial coefficients (A006116).

LINKS

Tilman Piesk, First 7 rows of triangle, flattened

Tilman Piesk, First 7 rows of triangle

CROSSREFS

Sequence in context: A132439 A116217 A274486 * A108838 A318176 A105070

Adjacent sequences:  A227958 A227959 A227960 * A227962 A227963 A227964

KEYWORD

nonn,tabf

AUTHOR

Tilman Piesk, Aug 01 2013

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 December 11 02:29 EST 2019. Contains 329911 sequences. (Running on oeis4.)