A268260 Number of length-(n+1) 0..7 arrays with new repeated values introduced in sequential order starting with zero.

57, 407, 2907, 20771, 148468, 1061632, 7594224, 54345509, 389060724, 2786424182, 19964380499, 143102062257, 1026171833136, 7361751375225, 52836226761762, 379380311345241, 2725291071400498, 19586141747713834, 140826889434423348

Offset: 1

Author

R. H. Hardin, Jan 29 2016

Keywords

• nonn

Comments

Column 7 of A268261.

Examples

			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
		

Links

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

Crossrefs

Cf. A268261.

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)