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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A086159 Number of partitions of n into the first three triangular numbers, 1, 3 and 6. 0
1, 1, 1, 2, 2, 2, 4, 4, 4, 6, 6, 6, 9, 9, 9, 12, 12, 12, 16, 16, 16, 20, 20, 20, 25, 25, 25, 30, 30, 30, 36, 36, 36, 42, 42, 42, 49, 49, 49, 56, 56, 56, 64, 64, 64, 72, 72, 72, 81, 81, 81, 90, 90, 90, 100, 100, 100, 110 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..57.

Jan Snellman and Michael Paulsen, Enumeration of Concave Integer Partitions, J. Integer Seqs., Vol. 7, 2004.

Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1,0,1,-1,0,-1,1).

FORMULA

G.f.: 1/((1-x)*(1-x^3)*(1-x^6))

CROSSREFS

Cf. A008620.

Sequence in context: A079438 A123050 A113694 * A029048 A086160 A029047

Adjacent sequences:  A086156 A086157 A086158 * A086160 A086161 A086162

KEYWORD

nonn

AUTHOR

Jan Snellman (Jan.Snellman(AT)math.su.se), Aug 25 2003

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 25 12:55 EDT 2019. Contains 324352 sequences. (Running on oeis4.)