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!)
A330376 Irregular triangle read by rows: T(n,k) is the total number of parts in all partitions of n with Durfee square of size k (n>=1; 1<=k<=floor(sqrt(n))). 0
1, 3, 6, 10, 2, 15, 5, 21, 14 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

Eric Weisstein's World of Mathematics, Durfee Square

EXAMPLE

Triangle begins:

   1;

   3;

   6;

  10,  2;

  15,  5;

  21, 14;

CROSSREFS

Row sums give A006128, n >= 1.

Column 1 gives A000217, n >= 1.

Cf. A114089, A115721, A115722, A115994, A116858, A118198, A208474, A330369, A330640, A330641, A330642, A330643.

Cf. A330369.

Sequence in context: A194047 A194035 A194049 * A120028 A333611 A329153

Adjacent sequences:  A330373 A330374 A330375 * A330377 A330378 A330379

KEYWORD

nonn,tabf,more

AUTHOR

Omar E. Pol, Dec 22 2019

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 October 22 16:15 EDT 2021. Contains 348174 sequences. (Running on oeis4.)