A189319 Number of nondecreasing arrangements of n+2 numbers in 0..n with the last equal to n and each after the second equal to the sum of one or two of the preceding four

2, 6, 11, 32, 54, 179, 253, 866, 1161, 3234, 4100, 12289, 11179, 28957, 35448, 81956, 60820, 184122, 127607, 389213, 298758, 584334, 434068, 1773649, 705685, 1778949, 1505153, 3979185, 1735705, 7116031, 2564548, 11409548, 5647305, 10489351

Offset

1,1

Comments

Diagonal of A189326

Links

R. H. Hardin, Table of n, a(n) for n = 1..57

Example

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

Crossrefs

Sequence in context: A365046 A296390 A135048 * A268501 A376981 A026564

Adjacent sequences: A189316 A189317 A189318 * A189320 A189321 A189322

Keyword

nonn

Author

R. H. Hardin Apr 20 2011

Status

approved