A248438 Number of length 5+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third

2, 9, 36, 165, 342, 601, 884, 1381, 1922, 2533, 3144, 3957, 4770, 5613, 6524, 7697, 8870, 10149, 11428, 12873, 14362, 15857, 17352, 19165, 21026, 22893, 24804, 26841, 28878, 31061, 33244, 35697, 38170, 40649, 43200, 45977, 48754, 51537, 54340, 57421

Offset

1,1

Comments

Row 5 of A248433

Links

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

Formula

Empirical: a(n) = a(n-1) -a(n-2) -a(n-6) +2*a(n-7) -3*a(n-8) +3*a(n-9) -a(n-10) +2*a(n-13) -3*a(n-14) +4*a(n-15) -4*a(n-16) +3*a(n-17) -a(n-18) -a(n-20) +3*a(n-21) -4*a(n-22) +4*a(n-23) -3*a(n-24) +2*a(n-25) -a(n-28) +3*a(n-29) -3*a(n-30) +2*a(n-31) -a(n-33) +a(n-34) -a(n-36) +a(n-37) -2*a(n-39) +3*a(n-40) -3*a(n-41) +a(n-42) -2*a(n-45) +3*a(n-46) -4*a(n-47) +4*a(n-48) -3*a(n-49) +a(n-50) +a(n-52) -3*a(n-53) +4*a(n-54) -4*a(n-55) +3*a(n-56) -2*a(n-57) +a(n-60) -3*a(n-61) +3*a(n-62) -2*a(n-63) +a(n-64) +a(n-68) -a(n-69) +a(n-70)

Example

Some solutions for n=6
..0....0....1....2....2....6....5....6....3....6....6....6....6....0....3....2
..2....4....1....1....2....2....1....2....2....4....4....4....4....2....5....3
..1....2....1....0....2....4....3....4....4....5....2....2....2....1....4....4
..3....0....1....2....2....3....5....3....6....3....0....3....3....3....3....5
..5....1....1....4....2....5....1....5....5....4....1....4....1....5....2....6
..1....2....1....3....2....4....3....1....4....2....2....2....2....4....4....4
..3....3....1....5....2....3....5....3....3....0....0....3....0....6....0....2

Crossrefs

Sequence in context: A150972 A150973 A150974 * A288780 A150975 A150976

Adjacent sequences: A248435 A248436 A248437 * A248439 A248440 A248441

Keyword

nonn

Author

R. H. Hardin, Oct 06 2014

Status

approved