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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A249286 Number of length n+3 0..4 arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth. 1
 524, 2228, 9504, 40588, 173368, 740616, 3164312, 13520668, 57772560, 246857788, 1054810472, 4507167504, 19258980852, 82293014888, 351635522044, 1502528043892, 6420257600360, 27433569837528, 117222829267252 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A249290. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 3*a(n-1) +3*a(n-2) +9*a(n-3) +35*a(n-4) -65*a(n-5) -151*a(n-6) -317*a(n-7) -534*a(n-8) -140*a(n-9) +1280*a(n-10) +2126*a(n-11) +2048*a(n-12) +5830*a(n-13) +4946*a(n-14) +11778*a(n-15) +25333*a(n-16) +19483*a(n-17) -11542*a(n-18) -9074*a(n-19) -7639*a(n-20) -13027*a(n-21) +38961*a(n-22) -25267*a(n-23) -187805*a(n-24) -120777*a(n-25) +143132*a(n-26) +88370*a(n-27) -57497*a(n-28) -100517*a(n-29) -152210*a(n-30) -3304*a(n-31) +156512*a(n-32) +254068*a(n-33) +111836*a(n-34) -84272*a(n-35) -31976*a(n-36) +9504*a(n-37) -3632*a(n-38) -144*a(n-39) +576*a(n-40). EXAMPLE Some solutions for n=5 ..2....0....0....1....1....2....2....1....1....1....0....2....0....0....0....0 ..3....4....3....0....1....0....1....2....0....2....2....1....2....3....1....2 ..1....4....1....4....2....0....0....1....0....4....0....4....2....2....1....2 ..0....0....3....4....3....0....3....3....2....3....0....2....3....1....4....0 ..3....4....2....1....3....4....4....0....3....2....1....4....3....4....0....0 ..2....0....4....4....1....3....3....4....4....2....4....3....3....2....4....1 ..0....3....2....4....4....2....0....0....2....0....4....0....1....2....4....1 ..2....2....3....2....1....2....3....1....0....3....1....3....3....1....4....0 CROSSREFS Cf. A249290. Sequence in context: A207199 A045209 A074889 * A283345 A125012 A281549 Adjacent sequences: A249283 A249284 A249285 * A249287 A249288 A249289 KEYWORD nonn AUTHOR R. H. Hardin, Oct 24 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 17 11:15 EDT 2024. Contains 375987 sequences. (Running on oeis4.)