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A254587 Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and the central column and the two maximums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2868, 17125, 96756, 545360, 3083065, 17163021, 94299759, 513689395, 2784287954, 15033788426, 81007656094, 435782949444, 2342282105203, 12580176218027, 67541357805877, 362492523075197, 1945139209520412, 10435768594838260 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 2 of A254586
LINKS
FORMULA
Empirical: a(n) = 12*a(n-1) -31*a(n-2) -138*a(n-3) +828*a(n-4) -1152*a(n-5) -516*a(n-6) +3120*a(n-7) -10242*a(n-8) +25971*a(n-9) -21553*a(n-10) -23255*a(n-11) +86873*a(n-12) -181029*a(n-13) +223910*a(n-14) -48622*a(n-15) -281148*a(n-16) +598492*a(n-17) -720262*a(n-18) +410453*a(n-19) +361755*a(n-20) -1153683*a(n-21) +1271501*a(n-22) -724554*a(n-23) -350616*a(n-24) +1664393*a(n-25) -1946703*a(n-26) +936016*a(n-27) +714120*a(n-28) -2211288*a(n-29) +2343444*a(n-30) -862717*a(n-31) -1272388*a(n-32) +2269089*a(n-33) -1454731*a(n-34) -85196*a(n-35) +1313620*a(n-36) -1290256*a(n-37) +181169*a(n-38) +689073*a(n-39) -724485*a(n-40) +253943*a(n-41) +182620*a(n-42) -309028*a(n-43) +159124*a(n-44) +26532*a(n-45) -58848*a(n-46) +14848*a(n-47) +2560*a(n-48) -1024*a(n-49) for n>55
EXAMPLE
Some solutions for n=3
..0..0..0..1..0....1..1..0..0..1....1..0..0..1..1....1..1..0..0..1
..0..0..1..0..1....0..0..0..1..0....1..0..0..1..0....1..1..1..1..1
..1..0..0..1..0....0..1..1..1..1....1..0..1..1..0....0..1..1..1..0
..1..1..1..0..0....0..1..1..0..1....1..1..0..1..1....1..1..0..0..1
CROSSREFS
Sequence in context: A235960 A235571 A327376 * A254580 A254355 A261859
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 01 2015
STATUS
approved

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Last modified July 16 11:34 EDT 2024. Contains 374347 sequences. (Running on oeis4.)