A248493 Number of length 4+5 0..n arrays with some three disjoint pairs in each consecutive six terms having the same sum

22, 183, 1156, 4285, 11586, 25495, 48808, 81225, 126358, 186091, 261804, 358693, 477970, 623571, 799888, 1008829, 1252710, 1539391, 1869148, 2246457, 2680546, 3170743, 3720888, 4342813, 5035822, 5803971, 6658156, 7601953, 8637618, 9778375

Offset

1,1

Comments

Row 4 of A248489

Links

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

Formula

Empirical: a(n) = -2*a(n-2) -2*a(n-4) +a(n-5) -a(n-6) +3*a(n-7) +a(n-8) +5*a(n-9) +3*a(n-10) +5*a(n-11) +3*a(n-12) +2*a(n-13) -3*a(n-15) -4*a(n-16) -8*a(n-17) -6*a(n-18) -10*a(n-19) -4*a(n-20) -7*a(n-21) +a(n-22) -a(n-23) +7*a(n-24) +4*a(n-25) +10*a(n-26) +6*a(n-27) +8*a(n-28) +4*a(n-29) +3*a(n-30) -2*a(n-32) -3*a(n-33) -5*a(n-34) -3*a(n-35) -5*a(n-36) -a(n-37) -3*a(n-38) +a(n-39) -a(n-40) +2*a(n-41) +2*a(n-43) +a(n-45)

Example

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

Crossrefs

Sequence in context: A191012 A248491 A248492 * A248494 A248495 A248496

Adjacent sequences: A248490 A248491 A248492 * A248494 A248495 A248496

Keyword

nonn

Author

R. H. Hardin, Oct 07 2014

Status

approved