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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A223978 Number of 5Xn 0..2 arrays with rows and antidiagonals unimodal 1
 243, 59049, 3628696, 84988435, 1140963027, 10676374380, 76942621022, 453969579904, 2284206888340, 10088688214569, 39954771229458, 144202872415543, 480339235745630, 1491693619175208, 4354474074592966 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 5 of A223975 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = (63370093/405483668029440000)*n^20 + (71859847/9357315416064000)*n^19 + (3840596671/12804747411456000)*n^18 + (16093136419/2134124568576000)*n^17 + (89468187533/627683696640000)*n^16 + (124873595783/62768369664000)*n^15 + (2671089252541/125536739328000)*n^14 + (32125296547501/188305108992000)*n^13 + (302581775150461/289700167680000)*n^12 + (44545336450771/9656672256000)*n^11 + (289473882894181/19313344512000)*n^10 + (311624791382747/9656672256000)*n^9 + (1803023416115741/34871316480000)*n^8 + (43416115518617/724250419200)*n^7 + (2936371270324637/47076277248000)*n^6 - (1561630187307499/2615348736000)*n^5 - (2687139777308839/111152321280000)*n^4 - (285271644066077/77189112000)*n^3 + (4647951175288301/586637251200)*n^2 - (79120764337/15519504)*n + 1710 for n>2 EXAMPLE Some solutions for n=3 ..0..0..1....0..0..0....0..0..1....0..0..0....0..0..1....0..0..1....0..0..1 ..0..1..1....0..0..2....0..2..0....0..2..0....0..1..0....0..1..2....0..1..0 ..0..0..0....1..2..0....0..1..1....2..2..2....2..1..1....0..1..2....2..1..1 ..0..0..0....0..2..0....1..1..2....2..1..0....2..2..2....0..2..2....2..2..1 ..0..1..0....0..0..1....0..1..1....1..0..0....0..1..1....1..1..1....0..2..1 CROSSREFS Sequence in context: A228975 A016949 A223792 * A223573 A223329 A216328 Adjacent sequences:  A223975 A223976 A223977 * A223979 A223980 A223981 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 4 15:36 EST 2021. Contains 349526 sequences. (Running on oeis4.)