The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A252869 Number of n X n nonnegative integer arrays with upper left 0 and lower right 2n-4 and value increasing by 0 or 1 with every step right or down. 2
 0, 1, 44, 615, 7313, 85801, 1030330, 12742873, 161937617, 2105918045, 27918122131, 376111502977, 5136280530303, 70961632168027, 990271171218092, 13940676224604419, 197768060575469207, 2824828302263709187, 40595088350375470407, 586585037283553891311 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS EXAMPLE Some solutions for n=3 ..0..0..1....0..0..0....0..0..1....0..1..1....0..1..1....0..1..2....0..1..2 ..1..1..1....0..0..1....0..0..1....1..1..2....0..1..1....0..1..2....1..2..2 ..1..2..2....1..1..2....0..1..2....1..2..2....1..2..2....1..1..2....2..2..2 CROSSREFS Main diagonal of A252876. Column d=2 of A323849. Sequence in context: A297680 A264680 A289647 * A296649 A221505 A160066 Adjacent sequences:  A252866 A252867 A252868 * A252870 A252871 A252872 KEYWORD nonn AUTHOR R. H. Hardin, Dec 24 2014 EXTENSIONS a(16)-a(20) from Alois P. Heinz, Feb 07 2019 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.

Last modified January 18 19:40 EST 2020. Contains 331029 sequences. (Running on oeis4.)