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A254477 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal minimum nondecreasing horizontally and vertically 1
2696, 11293, 50454, 170900, 603895, 1990286, 6557179, 20990158, 66511881, 206889218, 638407700, 1953110307, 5950273442, 18061423893, 54710654569, 165447019004, 499781356823, 1508449839592, 4550294119859, 13720340793246 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A254483
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) -21*a(n-2) +11*a(n-3) +45*a(n-4) -103*a(n-5) +115*a(n-6) -38*a(n-7) -107*a(n-8) -131*a(n-9) +921*a(n-10) -596*a(n-11) -2181*a(n-12) +5379*a(n-13) -6824*a(n-14) +4068*a(n-15) +5485*a(n-16) -16322*a(n-17) +22346*a(n-18) -18834*a(n-19) +189*a(n-20) +18197*a(n-21) -22297*a(n-22) +20167*a(n-23) -13557*a(n-24) +7411*a(n-25) -7586*a(n-26) +3540*a(n-27) +8543*a(n-28) -19094*a(n-29) +22262*a(n-30) -18776*a(n-31) +8091*a(n-32) +2783*a(n-33) -6540*a(n-34) +7569*a(n-35) -6328*a(n-36) +4240*a(n-37) -4436*a(n-38) +3729*a(n-39) -1549*a(n-40) -563*a(n-41) +2054*a(n-42) -2410*a(n-43) +1438*a(n-44) -269*a(n-45) -74*a(n-46) +186*a(n-47) -36*a(n-48) -200*a(n-49) +112*a(n-50) -32*a(n-51) -32*a(n-52) +80*a(n-53) -32*a(n-54) for n>62
EXAMPLE
Some solutions for n=4
..0..1..0..0....0..0..1..0....0..0..1..0....0..1..0..0....0..1..1..1
..0..1..0..0....0..1..1..1....0..1..0..1....0..1..0..1....0..1..1..0
..0..1..0..1....0..0..0..1....0..0..0..1....0..0..0..0....0..1..0..1
..1..1..0..1....1..1..1..1....1..1..1..0....1..1..1..0....1..0..1..1
..1..1..0..1....1..0..0..1....0..0..0..1....0..1..1..1....0..1..1..1
..0..1..0..1....1..0..1..1....1..0..0..1....0..0..1..1....1..0..1..1
CROSSREFS
Sequence in context: A210049 A254554 A254547 * A115930 A109994 A322525
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 31 2015
STATUS
approved

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Last modified April 17 18:43 EDT 2024. Contains 371765 sequences. (Running on oeis4.)