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A248536 Number of length n+3 0..7 arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth 1
512, 704, 992, 1412, 2000, 2960, 4424, 6644, 9968, 15356, 23648, 36380, 55856, 87680, 137072, 213500, 331424, 525044, 827144, 1296776, 2024480, 3222092, 5096048, 8016536, 12551888, 20024372, 31734104, 50006852, 78415616, 125248544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A248537

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = a(n-1) +12*a(n-4) -12*a(n-5) -47*a(n-8) +47*a(n-9) +81*a(n-12) -81*a(n-13) -76*a(n-16) +76*a(n-17) +36*a(n-20) -36*a(n-21) -8*a(n-24) +8*a(n-25)

EXAMPLE

Some solutions for n=6

..4....0....0....4....1....7....2....5....2....3....3....7....3....1....4....6

..4....3....3....5....2....0....0....3....6....5....6....0....1....3....7....3

..5....3....5....3....0....5....2....4....4....4....5....4....4....5....3....3

..3....6....4....4....5....4....4....4....4....4....6....5....4....3....2....4

..0....4....4....4....1....3....2....1....2....3....7....3....7....1....4....2

..4....3....7....1....2....4....0....3....6....5....6....4....5....3....3....3

..5....3....5....7....0....5....2....4....4....4....5....4....0....5....3....3

..3....6....0....4....1....0....4....4....4....0....2....1....4....3....6....0

..0....4....4....4....5....7....2....5....2....7....7....7....7....1....4....6

CROSSREFS

Sequence in context: A217849 A045003 A234136 * A202461 A046311 A036333

Adjacent sequences:  A248533 A248534 A248535 * A248537 A248538 A248539

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 08 2014

STATUS

approved

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Last modified January 20 02:13 EST 2019. Contains 319320 sequences. (Running on oeis4.)