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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A239407 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4 1
 12, 129, 1337, 13977, 144762, 1504399, 15591122, 161801518, 1677624003, 17403195529, 180479056305, 1871997954119, 19414915574725, 201369918597195, 2088509247416759, 21661501410101827, 224664541142404827 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A239405 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 8*a(n-1) +73*a(n-2) -446*a(n-3) -1413*a(n-4) +8070*a(n-5) +12185*a(n-6) -63420*a(n-7) -49358*a(n-8) +220534*a(n-9) +39486*a(n-10) -241802*a(n-11) +244780*a(n-12) -89648*a(n-13) -386680*a(n-14) -228008*a(n-15) +129984*a(n-16) -457816*a(n-17) -1064416*a(n-18) -330768*a(n-19) +556128*a(n-20) -351872*a(n-21) +769280*a(n-22) +407552*a(n-23) -200704*a(n-24) +32768*a(n-25) EXAMPLE Some solutions for n=4 ..3..3..1..3....3..1..0..0....3..3..1..3....0..3..3..0....0..0..3..3 ..0..2..1..3....2..2..3..1....2..2..2..2....0..0..0..3....0..0..0..2 ..2..0..1..1....0..2..0..1....2..2..3..1....0..2..0..0....3..3..2..2 CROSSREFS Sequence in context: A173359 A199037 A099157 * A163414 A111777 A209013 Adjacent sequences:  A239404 A239405 A239406 * A239408 A239409 A239410 KEYWORD nonn AUTHOR R. H. Hardin, Mar 17 2014 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 April 4 23:59 EDT 2020. Contains 333238 sequences. (Running on oeis4.)