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A254236 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal minimum nondecreasing horizontally and vertically 1
2616, 9209, 38392, 167637, 637570, 2228050, 7570126, 24603175, 77699926, 240604963, 731676813, 2193193398, 6506008066, 19128153912, 55819067155, 161889609500, 467100675752, 1341818201946, 3840365573161, 10956834925946 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A254242

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 12*a(n-1) -59*a(n-2) +149*a(n-3) -183*a(n-4) +4*a(n-5) +387*a(n-6) -898*a(n-7) +1676*a(n-8) -2700*a(n-9) +2747*a(n-10) -402*a(n-11) -2768*a(n-12) +3997*a(n-13) -6569*a(n-14) +16618*a(n-15) -28520*a(n-16) +26140*a(n-17) -1034*a(n-18) -40700*a(n-19) +77375*a(n-20) -78495*a(n-21) +39296*a(n-22) +12893*a(n-23) -55386*a(n-24) +75767*a(n-25) -68529*a(n-26) +44593*a(n-27) -16089*a(n-28) -9340*a(n-29) +25380*a(n-30) -34396*a(n-31) +37828*a(n-32) -33880*a(n-33) +23505*a(n-34) -6240*a(n-35) -12114*a(n-36) +20302*a(n-37) -17424*a(n-38) +10344*a(n-39) -3748*a(n-40) -171*a(n-41) +1387*a(n-42) -1676*a(n-43) +1939*a(n-44) -1745*a(n-45) +1052*a(n-46) -401*a(n-47) +51*a(n-48) +92*a(n-49) -137*a(n-50) +116*a(n-51) -60*a(n-52) +17*a(n-53) -2*a(n-54) for n>66

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..1..1..0....0..0..0..1....0..0..1..0....0..0..0..0

..0..0..0..1....0..0..0..1....1..1..1..0....0..1..0..0....0..0..0..0

..0..0..0..0....0..0..1..1....0..0..0..0....0..1..0..1....0..1..0..0

..1..1..1..1....1..1..1..1....0..1..0..0....1..1..0..0....0..0..0..1

..1..0..0..1....0..1..1..1....0..1..0..1....0..0..0..1....1..1..1..0

..0..0..0..1....1..1..1..1....1..0..1..1....0..1..1..1....0..0..0..1

CROSSREFS

Sequence in context: A235557 A257427 A257420 * A252440 A066871 A180650

Adjacent sequences:  A254233 A254234 A254235 * A254237 A254238 A254239

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2015

STATUS

approved

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Last modified January 22 19:16 EST 2020. Contains 331153 sequences. (Running on oeis4.)