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A189322 Number of nondecreasing arrangements of n+2 numbers in 0..5 with the last equal to 5 and each after the second equal to the sum of one or two of the preceding four. 1
8, 12, 21, 33, 54, 84, 119, 157, 195, 233, 271, 309, 347, 385, 423, 461, 499, 537, 575, 613, 651, 689, 727, 765, 803, 841, 879, 917, 955, 993, 1031, 1069, 1107, 1145, 1183, 1221, 1259, 1297, 1335, 1373, 1411, 1449, 1487, 1525, 1563, 1601, 1639, 1677, 1715 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A189326.

LINKS

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

FORMULA

Empirical: a(n) = 38*n - 147 for n>6.

Empirical g.f.: x*(8 - 4*x + 5*x^2 + 3*x^3 + 9*x^4 + 9*x^5 + 5*x^6 + 3*x^7) / (1 - x)^2. - Colin Barker, May 02 2018

EXAMPLE

Some solutions for n=3:

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

..2....2....3....5....3....2....2....1....3....5....3....5....5....3....4....5

..2....3....3....5....3....2....3....2....4....5....4....5....5....3....4....5

..4....3....5....5....4....3....4....3....5....5....4....5....5....3....4....5

..5....5....5....5....5....5....5....5....5....5....5....5....5....5....5....5

CROSSREFS

Cf. A189326.

Sequence in context: A300065 A072902 A269705 * A105571 A141616 A278902

Adjacent sequences:  A189319 A189320 A189321 * A189323 A189324 A189325

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2011

STATUS

approved

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Last modified June 19 12:57 EDT 2019. Contains 324222 sequences. (Running on oeis4.)