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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A281994 Number of set partitions of [n] into subsets whose element sums are squares. 2
1, 1, 0, 0, 1, 0, 1, 1, 7, 37, 22, 264, 310, 1181, 2350, 8102, 38471, 136528, 738072, 2811383, 12163208, 45121906, 160620225, 729516611, 3962353196 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Table of n, a(n) for n=0..24.

EXAMPLE

a(0) = 1: {}.

a(1) = 1: 1.

a(4) = 1: 1|234.

a(6) = 1: 1|2356|4.

a(7) = 1: 1|27|36|45.

a(8) = 7: 12345678, 1258|367|4, 1267|358|4, 1357|268|4, 13|268|457, 178|2356|4, 18|27|36|45.

a(10) = 22: 1|234|5678(10)|9, 1|23569|4|78(10), 1|2356|4|78(10)|9, 1|23578|4|69(10), 1|23578|4|6(10)|9, 1|23678(10)|45|9, 1|24578(10)|36|9, 1|27|34568(10)|9, 1|258(10)|3679|4, 1|258(10)|367|4|9, 1|258(10)|36|4|79, 1|259|36|4|78(10), 1|267(10)|3589|4, 1|267(10)|358|4|9, 1|2689|357(10)|4, 1|268|357(10)|4|9, 1|27|3589|4|6(10), 1|27|358|4|69(10), 1|27|358|4|6(10)|9, 1|2789(10)|36|45, 1|27|3689(10)|45, 1|27|36|4589(10).

CROSSREFS

Cf. A000110, A278339, A281871.

Sequence in context: A240274 A129737 A176544 * A246603 A043374 A038478

Adjacent sequences:  A281991 A281992 A281993 * A281995 A281996 A281997

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 04 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 19 18:39 EST 2019. Contains 329323 sequences. (Running on oeis4.)