A245955 Number of length 5+3 0..n arrays with some pair in every consecutive four terms totalling exactly n

162, 4145, 26244, 128649, 381222, 1021225, 2217096, 4555697, 8345130, 14757441, 24276492, 38959225, 59493294, 89187449, 128950032, 183778785, 254805426, 349227217, 468384660, 622261481, 812372022, 1052152905, 1343233944

Offset

1,1

Comments

Row 5 of A245950

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +4*a(n-2) -10*a(n-3) -5*a(n-4) +20*a(n-5) -20*a(n-7) +5*a(n-8) +10*a(n-9) -4*a(n-10) -2*a(n-11) +a(n-12)

Example

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

Crossrefs

Sequence in context: A303413 A249295 A221871 * A128803 A035746 A285046

Adjacent sequences: A245952 A245953 A245954 * A245956 A245957 A245958

Keyword

nonn

Author

R. H. Hardin, Aug 08 2014

Status

approved