login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The OnLine Encyclopedia of Integer Sequences
!)
A281965
Number of sets of exactly n positive integers <= n+2 having a square element sum.
2
1, 1, 1, 2, 2, 2, 3, 4, 3, 3, 5, 4, 4, 5, 7, 5, 5, 9, 6, 6, 8, 9, 7, 7, 13, 8, 8, 12, 11, 9, 10, 15, 10, 10, 16, 13, 11, 14, 17, 12, 12, 20, 14, 13, 18, 19, 14, 15, 24, 15, 15, 22, 20, 16, 19, 26, 17, 17, 27, 20, 18, 23, 27, 19, 19, 33, 20, 20, 28, 27, 21, 23
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
0,4
LINKS
Alois P. Heinz,
Table of n, a(n) for n = 0..1000
FORMULA
a(n) =
A281871
(n+2,n).
EXAMPLE
a(7) = 4: {1,2,3,6,7,8,9}, {1,2,4,5,7,8,9}, {1,3,4,5,6,8,9}, {2,3,4,5,6,7,9}.
a(8) = 3: {1,2,3,4,5,6,7,8}, {1,3,5,6,7,8,9,10}, {2,3,4,6,7,8,9,10}.
a(9) = 3: {1,2,3,4,5,6,7,10,11}, {1,2,3,4,5,6,8,9,11}, {1,2,3,4,5,7,8,9,10}.
CROSSREFS
A diagonal of
A281871
.
Sequence in context:
A178065
A057748
A057747
*
A228074
A152803
A347102
Adjacent sequences:
A281962
A281963
A281964
*
A281966
A281967
A281968
KEYWORD
nonn
,
look
AUTHOR
Alois P. Heinz
, Feb 03 2017
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 September 26 05:45 EDT 2023. Contains 365653 sequences. (Running on oeis4.)