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

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

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 * A347168 A281374 A190416

Adjacent sequences: A249290 A249291 A249292 * A249294 A249295 A249296

Keyword

nonn

Author

R. H. Hardin, Oct 24 2014

Status

approved