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A258676 Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum 1
8320, 67600, 635440, 5973136, 51939888, 451647504, 4096960560, 37164128400, 329478755760, 2920995464464, 26224710993712, 235445578423696, 2099178946945200, 18715799552490000, 167514610643031600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A258681

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -16*a(n-2) +208*a(n-3) +4712*a(n-4) -2904*a(n-5) +72928*a(n-6) -376480*a(n-7) -6880000*a(n-8) -690688*a(n-9) -93244416*a(n-10) +217147392*a(n-11) +4038631424*a(n-12) +1051099136*a(n-13) +52312670208*a(n-14) -53388509184*a(n-15) -1049520766976*a(n-16) -121475432448*a(n-17) -13177328762880*a(n-18) +9328937402368*a(n-19) +126283849662464*a(n-20) +9629316677632*a(n-21) +1510282299965440*a(n-22) -964821453373440*a(n-23) -6641050231767040*a(n-24) -2199023255552000*a(n-25) -73535337665658880*a(n-26) +37154696925806592*a(n-27) +108086391056891904*a(n-28) +144115188075855872*a(n-29) +1152921504606846976*a(n-30)

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Cf. A258681

Sequence in context: A250991 A206192 A252155 * A170778 A062852 A124414

Adjacent sequences:  A258673 A258674 A258675 * A258677 A258678 A258679

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 07 2015

STATUS

approved

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Last modified May 19 16:50 EDT 2022. Contains 353847 sequences. (Running on oeis4.)