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 A250438 Number of (n+1)X(3+1) 0..2 arrays with nondecreasing sum of every two consecutive values in every row and column 1
 1296, 14400, 160000, 1000000, 6250000, 27562500, 121550625, 423536400, 1475789056, 4337012736, 12745506816, 32920473600, 85030560000, 198470250000, 463250390625, 996503062500, 2143588810000, 4311270849600, 8670998958336 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A250443 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +14*a(n-2) -30*a(n-3) -90*a(n-4) +210*a(n-5) +350*a(n-6) -910*a(n-7) -910*a(n-8) +2730*a(n-9) +1638*a(n-10) -6006*a(n-11) -2002*a(n-12) +10010*a(n-13) +1430*a(n-14) -12870*a(n-15) +12870*a(n-17) -1430*a(n-18) -10010*a(n-19) +2002*a(n-20) +6006*a(n-21) -1638*a(n-22) -2730*a(n-23) +910*a(n-24) +910*a(n-25) -350*a(n-26) -210*a(n-27) +90*a(n-28) +30*a(n-29) -14*a(n-30) -2*a(n-31) +a(n-32) Empirical for n mod 2 = 0: a(n) = (1/1358954496)*n^16 + (5/84934656)*n^15 + (31/14155776)*n^14 + (2135/42467328)*n^13 + (33847/42467328)*n^12 + (32735/3538944)*n^11 + (431429/5308416)*n^10 + (1463225/2654208)*n^9 + (5160755/1769472)*n^8 + (8008825/663552)*n^7 + (12913699/331776)*n^6 + (6965/72)*n^5 + (139417/768)*n^4 + (23855/96)*n^3 + (3741/16)*n^2 + 135*n + 36 Empirical for n mod 2 = 1: a(n) = (1/1358954496)*n^16 + (5/84934656)*n^15 + (373/169869312)*n^14 + (1435/28311552)*n^13 + (275299/339738624)*n^12 + (807985/84934656)*n^11 + (14409143/169869312)*n^10 + (49767325/84934656)*n^9 + (2153003003/679477248)*n^8 + (380990005/28311552)*n^7 + (7598369275/169869312)*n^6 + (9778683875/84934656)*n^5 + (76415846875/339738624)*n^4 + (9127365625/28311552)*n^3 + (2011296875/6291456)*n^2 + (616328125/3145728)*n + (937890625/16777216) EXAMPLE Some solutions for n=3 ..0..1..0..1....0..0..1..1....0..0..0..2....0..0..1..0....0..0..0..1 ..1..2..2..2....0..0..0..0....1..2..2..2....1..0..2..1....0..1..2..2 ..0..1..0..1....0..1..2..2....2..2..2..2....0..2..2..2....1..0..2..2 ..2..2..2..2....0..0..1..1....2..2..2..2....1..1..2..1....0..1..2..2 CROSSREFS Sequence in context: A276282 A137488 A189991 * A221006 A016864 A064785 Adjacent sequences: A250435 A250436 A250437 * A250439 A250440 A250441 KEYWORD nonn AUTHOR R. H. Hardin, Nov 22 2014 STATUS approved

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Last modified July 16 08:10 EDT 2024. Contains 374345 sequences. (Running on oeis4.)