login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A025769 Expansion of 1/((1-x)(1-x^3)(1-x^8)). 1
1, 1, 1, 2, 2, 2, 3, 3, 4, 5, 5, 6, 7, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 23, 24, 25, 27, 28, 30, 32, 33, 35, 37, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 61, 63, 65, 68, 70, 72, 75, 77, 80, 83, 85, 88 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Mark Underwood observed that the number of partitions into four nonzero squares of the squares of primes is given by A025428(A001248(n)) = a(prime(n)-4), cf. sequence A216374. - M. F. Hasler, Sep 16 2012

LINKS

Table of n, a(n) for n=0..59.

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

FORMULA

a(n) = floor((x^2+12x+c)/48) with 51 <= c <= 58. - M. F. Hasler, Sep 16 2012

a(0)=1, a(1)=1, a(2)=1, a(3)=2, a(4)=2, a(5)=2, a(6)=3, a(7)=3, a(8)=4, a(9)=5, a(10)=5, a(11)=6, a(n)=a(n-1)+a(n-3)-a(n-4)+a(n-8)-a(n-9)- a(n-11)+ a(n-12). - Harvey P. Dale, Nov 29 2012

MATHEMATICA

CoefficientList[Series[1/((1-x)(1-x^3)(1-x^8)), {x, 0, 60}], x] (* or *) LinearRecurrence[{1, 0, 1, -1, 0, 0, 0, 1, -1, 0, -1, 1}, {1, 1, 1, 2, 2, 2, 3, 3, 4, 5, 5, 6}, 60] (* Harvey P. Dale, Nov 29 2012 *)

PROG

(PARI) A025769(n)=((x+6)^2+16)\48 \\ - M. F. Hasler, Sep 16 2012

CROSSREFS

Sequence in context: A107631 A029098 A074286 * A103563 A008625 A029148

Adjacent sequences: A025766 A025767 A025768 * A025770 A025771 A025772

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 30 03:32 EST 2023. Contains 359939 sequences. (Running on oeis4.)