A246735 Number of length n+4 0..6 arrays with no pair in any consecutive five terms totalling exactly 6.

3876, 15960, 66378, 276762, 1152576, 4791012, 19906740, 82727094, 343911336, 1430080296, 5946396012, 24722787264, 102780120750, 427285990662, 1776417823830, 7385542897866, 30705819911322, 127659940718424

Offset

1,1

Comments

Column 6 of A246737.

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +a(n-2) +a(n-3) +5*a(n-4) +202*a(n-5) +94*a(n-6) +129*a(n-7) +278*a(n-8) +35*a(n-9) -197*a(n-10) -164*a(n-11) +272*a(n-12) +119*a(n-13) -9*a(n-14) +17*a(n-15) +158*a(n-16) +27*a(n-17) -19*a(n-18) -18*a(n-19) -a(n-20) -2*a(n-21) +2*a(n-22) +a(n-23).

Example

Some solutions for n=3
..5....2....3....0....3....2....3....6....4....4....5....2....0....4....2....0
..2....0....0....1....6....0....6....4....0....3....5....0....5....5....3....0
..2....2....5....0....1....1....6....1....5....4....2....1....0....6....5....4
..5....0....5....1....1....3....5....4....5....1....2....1....2....5....2....5
..2....0....0....4....6....2....2....6....3....1....0....3....0....5....2....3
..2....2....4....1....3....2....3....1....0....4....2....4....0....6....0....0
..2....5....0....3....2....2....2....4....0....1....5....0....3....2....3....4

Crossrefs

Cf. A246737.

Sequence in context: A035781 A108005 A065696 * A283026 A014891 A253484

Adjacent sequences: A246732 A246733 A246734 * A246736 A246737 A246738

Keyword

nonn

Author

R. H. Hardin, Sep 02 2014

Status

approved