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 A247406 Number of length 2+4 0..n arrays with no disjoint pairs in any consecutive five terms having the same sum 1
 0, 40, 264, 1544, 6216, 19080, 49032, 113896, 237456, 466640, 856512, 1494696, 2491584, 4009888, 6231576, 9423824, 13882728, 20009088, 28250184, 39194656, 53468496, 71900744, 95363904, 124954128, 161852112, 207511288, 263443896 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 2 of A247404 LINKS R. H. Hardin, Table of n, a(n) for n = 1..95 FORMULA Empirical: a(n) = a(n-1) +a(n-3) +a(n-4) -a(n-5) -2*a(n-7) -a(n-8) -a(n-9) +a(n-11) +3*a(n-12) +a(n-13) +2*a(n-14) -2*a(n-16) -a(n-17) -3*a(n-18) -a(n-19) +a(n-21) +a(n-22) +2*a(n-23) +a(n-25) -a(n-26) -a(n-27) -a(n-29) +a(n-30) EXAMPLE Some solutions for n=6 ..5....5....0....6....1....2....5....4....4....3....0....0....6....0....5....0 ..4....3....6....5....6....6....6....5....3....5....5....6....6....1....4....6 ..2....0....2....2....3....6....5....4....3....5....5....3....3....5....0....4 ..2....3....6....0....3....0....2....6....0....5....5....2....6....2....4....1 ..6....3....6....0....2....3....0....1....5....0....3....2....1....0....4....4 ..2....2....5....1....3....6....0....6....3....2....6....4....6....5....5....0 CROSSREFS Sequence in context: A223426 A290127 A115170 * A229588 A334121 A117216 Adjacent sequences: A247403 A247404 A247405 * A247407 A247408 A247409 KEYWORD nonn AUTHOR R. H. Hardin, Sep 16 2014 STATUS approved

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Last modified December 4 16:44 EST 2023. Contains 367563 sequences. (Running on oeis4.)