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A249293 Number of length 3+3 0..n arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth 1
48, 428, 2144, 9504, 29100, 76856, 178644, 374540, 723300, 1314744, 2258528, 3717444, 5893024, 9039940, 13477788, 19618656, 27921268, 38978528, 53474096, 72214004, 96133160, 126348344, 164077052, 210790324, 268108160, 337868944 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A249290

LINKS

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

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

CROSSREFS

Sequence in context: A339761 A232917 A172201 * A281374 A190416 A231342

Adjacent sequences:  A249290 A249291 A249292 * A249294 A249295 A249296

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 24 2014

STATUS

approved

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Last modified January 18 12:44 EST 2021. Contains 340254 sequences. (Running on oeis4.)