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A268260 Number of length-(n+1) 0..7 arrays with new repeated values introduced in sequential order starting with zero. 1
57, 407, 2907, 20771, 148468, 1061632, 7594224, 54345509, 389060724, 2786424182, 19964380499, 143102062257, 1026171833136, 7361751375225, 52836226761762, 379380311345241, 2725291071400498, 19586141747713834, 140826889434423348 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268261.

LINKS

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

FORMULA

Empirical: a(n) = 57*a(n-1) -1400*a(n-2) +19187*a(n-3) -157759*a(n-4) +765212*a(n-5) -1872339*a(n-6) +503475*a(n-7) +6299972*a(n-8) -2706851*a(n-9) -14207501*a(n-10) -11689832*a(n-11) -4172972*a(n-12) -680688*a(n-13) -40320*a(n-14)

EXAMPLE

Some solutions for n=5

..6....7....3....1....6....4....1....5....1....2....7....0....5....5....1....4

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

..2....4....3....6....2....4....1....4....0....3....3....0....3....3....6....0

..3....0....5....4....7....7....5....1....2....4....4....7....7....1....0....5

..7....0....7....0....6....2....4....7....5....0....7....2....5....4....7....1

..6....6....6....5....5....6....5....5....0....5....2....4....7....6....2....6

CROSSREFS

Cf. A268261.

Sequence in context: A211147 A237360 A076459 * A184224 A337629 A218812

Adjacent sequences:  A268257 A268258 A268259 * A268261 A268262 A268263

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2016

STATUS

approved

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Last modified October 5 08:23 EDT 2022. Contains 357252 sequences. (Running on oeis4.)