cp's OEIS Frontend

A247537 Number of length 5+3 0..n arrays with some disjoint pairs in every consecutive four terms having the same sum.

%I A247537 #6 Jul 23 2025 11:36:07
%S A247537 8,105,604,1823,4228,8051,13668,21609,31924,45309,61740,82067,105968,
%T A247537 134635,167680,206001,249072,298861,354032,416027,484464,560643,
%U A247537 643428,735401,834308,942581,1059436,1186239,1321332,1468271,1624036,1791277
%N A247537 Number of length 5+3 0..n arrays with some disjoint pairs in every consecutive four terms having the same sum.
%C A247537 Row 5 of A247533
%H A247537 R. H. Hardin, <a href="/A247537/b247537.txt">Table of n, a(n) for n = 1..210</a>
%F A247537 Empirical: a(n) = -3*a(n-1) -6*a(n-2) -10*a(n-3) -15*a(n-4) -19*a(n-5) -21*a(n-6) -20*a(n-7) -15*a(n-8) -5*a(n-9) +9*a(n-10) +26*a(n-11) +44*a(n-12) +60*a(n-13) +71*a(n-14) +75*a(n-15) +70*a(n-16) +55*a(n-17) +32*a(n-18) +3*a(n-19) -29*a(n-20) -60*a(n-21) -85*a(n-22) -102*a(n-23) -108*a(n-24) -102*a(n-25) -85*a(n-26) -60*a(n-27) -29*a(n-28) +3*a(n-29) +32*a(n-30) +55*a(n-31) +70*a(n-32) +75*a(n-33) +71*a(n-34) +60*a(n-35) +44*a(n-36) +26*a(n-37) +9*a(n-38) -5*a(n-39) -15*a(n-40) -20*a(n-41) -21*a(n-42) -19*a(n-43) -15*a(n-44) -10*a(n-45) -6*a(n-46) -3*a(n-47) -a(n-48)
%F A247537 Also as a cubic plus a linear quasipolynomial with period 27720, first 12 listed:
%F A247537 Empirical for n mod 27720 = 0: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (878029/6930)*n + 1
%F A247537 Empirical for n mod 27720 = 1: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (3587189/34650)*n - (44311/13860)
%F A247537 Empirical for n mod 27720 = 2: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (420821/3850)*n + (45853/2475)
%F A247537 Empirical for n mod 27720 = 3: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (716329/6930)*n + (17263/300)
%F A247537 Empirical for n mod 27720 = 4: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (4379057/34650)*n - (891203/17325)
%F A247537 Empirical for n mod 27720 = 5: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (198223/2310)*n + (44759/252)
%F A247537 Empirical for n mod 27720 = 6: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (4395689/34650)*n - (68743/1155)
%F A247537 Empirical for n mod 27720 = 7: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (3587189/34650)*n + (341887/9900)
%F A247537 Empirical for n mod 27720 = 8: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (84041/770)*n + (1394257/17325)
%F A247537 Empirical for n mod 27720 = 9: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (3570557/34650)*n + (56851/1100)
%F A247537 Empirical for n mod 27720 = 10: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (878029/6930)*n - (9023/99)
%F A247537 Empirical for n mod 27720 = 11: a(n) = (1027297/17325)*n^3 - (3502537/23100)*n^2 + (992963/11550)*n + (275239/1260)
%e A247537 Some solutions for n=6
%e A247537 ..3....6....4....4....3....2....5....5....4....1....3....2....5....2....5....6
%e A247537 ..1....2....2....3....2....1....6....4....0....2....2....6....6....2....4....4
%e A247537 ..2....1....3....4....4....5....0....6....6....5....4....3....3....1....4....5
%e A247537 ..0....5....1....3....1....6....1....5....2....4....3....5....2....1....5....3
%e A247537 ..1....4....0....2....5....2....5....5....4....3....3....2....5....0....3....4
%e A247537 ..3....0....4....1....0....1....4....4....0....6....2....4....6....2....4....2
%e A247537 ..4....1....5....0....4....5....2....4....6....5....4....3....1....3....4....3
%e A247537 ..6....5....1....3....1....6....3....5....2....2....3....1....0....5....3....3
%K A247537 nonn
%O A247537 1,1
%A A247537 _R. H. Hardin_, Sep 18 2014