A246895 Number of length 3+4 0..n arrays with some pair in every consecutive five terms totalling exactly n

112, 1961, 12544, 57585, 177648, 484297, 1079680, 2256929, 4207600, 7537641, 12554112, 20344081, 31352944, 47355785, 68954368, 98858817, 137838960, 189828649, 255769600, 341151281, 447081712, 580982601, 744111744, 946245985

Offset

1,1

Comments

Row 3 of A246892

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=5
..1....0....3....0....3....1....1....1....1....3....3....1....1....0....1....0
..0....3....0....4....2....0....3....3....3....1....5....0....3....2....1....4
..1....3....4....3....0....5....2....1....2....3....2....4....2....4....1....0
..1....2....1....1....3....4....0....2....0....2....1....0....1....2....2....0
..4....0....1....5....4....2....2....3....2....2....3....1....5....1....4....5
..3....0....5....2....5....1....1....3....1....4....4....4....1....3....2....4
..3....1....1....5....4....5....5....2....4....4....5....3....3....4....0....4

Crossrefs

Sequence in context: A210293 A203915 A233884 * A188153 A163194 A267327

Adjacent sequences: A246892 A246893 A246894 * A246896 A246897 A246898

Keyword

nonn

Author

R. H. Hardin, Sep 06 2014

Status

approved