A246741 - OEIS

A246741

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

2, 30, 1156, 7612, 66294, 276762, 1231304, 3780600, 11549290, 28599190, 69230412, 147079860, 304811486, 578865042, 1074611344, 1875204592, 3208049874, 5242291470, 8421730580, 13061681580, 19963508422, 29676180490, 43560086616

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 4 of A246737

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..69

FORMULA

Empirical: a(n) = 3*a(n-1) +3*a(n-2) -17*a(n-3) +3*a(n-4) +39*a(n-5) -25*a(n-6) -45*a(n-7) +45*a(n-8) +25*a(n-9) -39*a(n-10) -3*a(n-11) +17*a(n-12) -3*a(n-13) -3*a(n-14) +a(n-15)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A338044 A350719 A140174 * A089016 A364504 A262004

Adjacent sequences: A246738 A246739 A246740 * A246742 A246743 A246744

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 02 2014

STATUS

approved