A189320 Number of nondecreasing arrangements of n+2 numbers in 0..3 with the last equal to 3 and each after the second equal to the sum of one or two of the preceding four

5, 7, 11, 16, 22, 28, 34, 40, 46, 52, 58, 64, 70, 76, 82, 88, 94, 100, 106, 112, 118, 124, 130, 136, 142, 148, 154, 160, 166, 172, 178, 184, 190, 196, 202, 208, 214, 220, 226, 232, 238, 244, 250, 256, 262, 268, 274, 280, 286, 292, 298, 304, 310, 316, 322, 328, 334, 340

Offset

1,1

Comments

Column 3 of A189326

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n) = 6*n - 8 for n>3

Example

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

Crossrefs

Sequence in context: A072058 A072055 A314300 * A107448 A147853 A111226

Adjacent sequences: A189317 A189318 A189319 * A189321 A189322 A189323

Keyword

nonn

Author

R. H. Hardin Apr 20 2011

Status

approved