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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A210128 Number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock having one, three or four distinct values, and new values 0..3 introduced in row major order. 1
 81, 2609, 84381, 2731088, 88392872, 2860882075, 92593947153, 2996851648908, 96994674850240, 3139283505544719, 101604556573346177, 3288484744444601296, 106433532896116499960, 3444777094948014560211, 111492016763745516373473 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A210134. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 35*a(n-1) - 81*a(n-2) - 153*a(n-3) + 492*a(n-4) - 292*a(n-5). Empirical g.f.: x*(81 - 226*x - 373*x^2 + 1475*x^3 - 1022*x^4) / ((1 - x)*(1 - 34*x + 47*x^2 + 200*x^3 - 292*x^4)). - Colin Barker, Jul 14 2018 EXAMPLE Some solutions for n=4: 0 0 0 0 0 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 0 1 2 1 2 1 1 1 2 3 0 2 3 0 0 2 2 1 1 1 2 1 1 3 2 0 2 0 3 1 1 1 1 0 2 3 1 3 0 2 0 1 3 0 3 0 3 0 1 1 0 2 3 2 3 1 2 0 2 0 1 1 3 0 0 1 3 2 1 2 3 0 1 3 0 0 1 0 1 1 3 0 CROSSREFS Cf. A210134. Sequence in context: A295274 A206534 A231859 * A297084 A018223 A206660 Adjacent sequences: A210125 A210126 A210127 * A210129 A210130 A210131 KEYWORD nonn AUTHOR R. H. Hardin, Mar 17 2012 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 September 11 23:02 EDT 2024. Contains 375842 sequences. (Running on oeis4.)