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A189327 Number of nondecreasing arrangements of 4 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
2, 6, 7, 12, 12, 18, 17, 24, 22, 30, 27, 36, 32, 42, 37, 48, 42, 54, 47, 60, 52, 66, 57, 72, 62, 78, 67, 84, 72, 90, 77, 96, 82, 102, 87, 108, 92, 114, 97, 120, 102, 126, 107, 132, 112, 138, 117, 144, 122, 150, 127, 156, 132, 162, 137, 168, 142, 174, 147, 180, 152, 186, 157 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A189326

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) -a(n-4)

EXAMPLE

All solutions for n=3

..0....3....1....1....1....2....1

..3....3....2....1....3....3....2

..3....3....3....2....3....3....2

..3....3....3....3....3....3....3

CROSSREFS

Sequence in context: A079906 A226814 A233419 * A217575 A172154 A293531

Adjacent sequences:  A189324 A189325 A189326 * A189328 A189329 A189330

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 20 2011

STATUS

approved

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Last modified November 19 16:10 EST 2017. Contains 294936 sequences.