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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A224053 Number of n X 4 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing. 1
 46, 698, 5219, 27246, 115716, 428949, 1442005, 4492529, 13133871, 36307595, 95412314, 239342404, 575169570, 1328404782, 2957341785, 6363295591, 13266197675, 26858140315, 52913319943, 101631438086, 190636635796 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A224057. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = (1/106748928000)*n^16 + (1/2668723200)*n^15 + (29/2335132800)*n^14 + (9677/37362124800)*n^13 + (129359/28740096000)*n^12 + (171629/2874009600)*n^11 + (12139/18662400)*n^10 + (195851/37324800)*n^9 + (231935077/5225472000)*n^8 + (74110763/261273600)*n^7 + (324341569/179625600)*n^6 + (4052978161/718502400)*n^5 + (3589053277/247104000)*n^4 - (12388141/741312)*n^3 + (87129737/1029600)*n^2 + (364945/2574)*n - 457 for n>3. EXAMPLE Some solutions for n=3 ..0..0..0..0....0..0..0..1....0..0..0..0....0..0..1..1....2..1..0..0 ..2..1..1..1....0..0..1..0....2..1..0..0....0..1..2..0....1..1..1..2 ..1..2..2..0....1..1..1..0....1..1..2..0....1..2..1..0....1..1..2..2 CROSSREFS Cf. A224057. Sequence in context: A160151 A278204 A223929 * A224306 A224370 A078156 Adjacent sequences: A224050 A224051 A224052 * A224054 A224055 A224056 KEYWORD nonn AUTHOR R. H. Hardin, Mar 30 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 11 04:26 EDT 2024. Contains 375059 sequences. (Running on oeis4.)