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A268322 Number of length-(n+1) 0..3 arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero. 1
2, 4, 11, 32, 102, 337, 1148, 3984, 14030, 49973, 179735, 652010, 2383857, 8779485, 32555471, 121497802, 456178652, 1722502343, 6538543106, 24942393310, 95581407132, 367817900179, 1420912978925, 5508514801624, 21423891255215 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A268327.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 15*a(n-1) -83*a(n-2) +181*a(n-3) +20*a(n-4) -632*a(n-5) +445*a(n-6) +849*a(n-7) -637*a(n-8) -673*a(n-9) +208*a(n-10) +260*a(n-11) +48*a(n-12)

EXAMPLE

Some solutions for n=10

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..1....1....0....0....1....1....1....1....1....0....1....1....1....0....0....0

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

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

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

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

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

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

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

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

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

CROSSREFS

Cf. A268327.

Sequence in context: A135339 A148170 A156043 * A148171 A318644 A113774

Adjacent sequences:  A268319 A268320 A268321 * A268323 A268324 A268325

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 01 2016

STATUS

approved

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Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)