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!)
A223637 T(n,k)=Number of nXk 0..1 arrays with rows, antidiagonals and columns unimodal 7
2, 4, 4, 7, 16, 7, 11, 49, 49, 11, 16, 121, 229, 121, 16, 22, 256, 801, 801, 256, 22, 29, 484, 2297, 3712, 2297, 484, 29, 37, 841, 5699, 13599, 13599, 5699, 841, 37, 46, 1369, 12657, 42109, 61545, 42109, 12657, 1369, 46, 56, 2116, 25753, 114713, 230619, 230619 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

..2....4.....7......11.......16........22........29.........37..........46

..4...16....49.....121......256.......484.......841.......1369........2116

..7...49...229.....801.....2297......5699.....12657......25753.......48811

.11..121...801....3712....13599.....42109....114713.....282273......639165

.16..256..2297...13599....61545....230619....748950....2171533.....5738616

.22..484..5699...42109...230619...1026377...3907140...13135511....39889555

.29..841.12657..114713...748950...3907140..17224974...66448428...229624238

.37.1369.25753..282273..2171533..13135511..66448428..291563806..1138171082

.46.2116.48811..639165..5738616..39889555.229624238.1138171082..4984273228

.56.3136.87253.1350228.14032520.111242770.723456027.4024198094.19665608377

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..263

FORMULA

Columns k=1..7 are polynomial of degree 2*k for n > 0,0,0,2,8,12

EXAMPLE

Some solutions for n=4 k=4

..0..1..1..0....0..0..0..1....1..1..1..0....0..0..0..0....0..1..1..0

..1..1..1..1....0..0..0..1....1..1..1..1....1..1..1..0....0..1..1..1

..0..0..1..0....1..0..0..0....0..0..1..0....0..1..1..0....0..0..1..0

..0..0..0..0....0..0..0..0....0..0..1..0....0..0..0..0....0..0..1..0

CROSSREFS

Column 1 is A000124

Column 2 is A086601

Sequence in context: A240338 A227103 A223644 * A223620 A227679 A223782

Adjacent sequences:  A223634 A223635 A223636 * A223638 A223639 A223640

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Mar 24 2013

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 27 12:51 EST 2021. Contains 349394 sequences. (Running on oeis4.)