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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A094415 Triangle T read by rows: dot product <r,r-1,...,1> * <s+1,s+2,...,r,1,2,...,s>. 9
1, 4, 5, 10, 13, 13, 20, 26, 28, 26, 35, 45, 50, 50, 45, 56, 71, 80, 83, 80, 71, 84, 105, 119, 126, 126, 119, 105, 120, 148, 168, 180, 184, 180, 168, 148, 165, 201, 228, 246, 255, 255, 246, 228, 201, 220, 265, 300, 325, 340, 345, 340, 325, 300, 265, 286, 341 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..56.

FORMULA

T(r, s) = r[r^2 + 3r(1+s) + 2 - 3s^2], r>0, 0<=s<=r.

EXAMPLE

1

4 5

10 13 13

20 26 28 26

35 45 50 50 45

56 71 80 83 80 71

CROSSREFS

Columns 0-6 are A000292, A008778, A026054, A026057, A026060, A026063, A026066. Half-diagonal is A050410, row sums are A000537. See also A094414, A088003.

Sequence in context: A217571 A058335 A222353 * A114517 A283246 A236283

Adjacent sequences:  A094412 A094413 A094414 * A094416 A094417 A094418

KEYWORD

nonn,tabl

AUTHOR

Ralf Stephan, May 02 2004

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 23 16:52 EDT 2017. Contains 286925 sequences.