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A204614 Number of (n+1)X7 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards 1

%I #5 Mar 31 2012 12:37:02

%S 2470,62031,1322417,30487865,681254361,15468240213,349154906413,

%T 7906679632133,178861353295693,4048711525940229,91630607640716125,

%U 2074053395951695477,46944781686731659341,1062590925213315251173

%N Number of (n+1)X7 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards

%C Column 6 of A204616

%H R. H. Hardin, <a href="/A204614/b204614.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 72*a(n-1) -1931*a(n-2) +19538*a(n-3) +100413*a(n-4) -4242004*a(n-5) +31231687*a(n-6) +110702986*a(n-7) -2919035988*a(n-8) +11380887064*a(n-9) +71438254316*a(n-10) -735184874216*a(n-11) +675698711376*a(n-12) +16578796382048*a(n-13) -64756353344576*a(n-14) -134173857715072*a(n-15) +1349514026669568*a(n-16) -1039438519612416*a(n-17) -13947460019884032*a(n-18) +34445222660911104*a(n-19) +70739200089346048*a(n-20) -362446115954745344*a(n-21) -24525620663205888*a(n-22) +2135885372576268288*a(n-23) -2011581611939921920*a(n-24) -7584501613718536192*a(n-25) +13784598207526076416*a(n-26) +15135741320257601536*a(n-27) -49130653604522229760*a(n-28) -9105973595592458240*a(n-29) +108430684964582850560*a(n-30) -32076543208607186944*a(n-31) -153800125421683998720*a(n-32) +93832220411741339648*a(n-33) +139601887625434103808*a(n-34) -119220988390991200256*a(n-35) -78629286118437158912*a(n-36) +84845767721914204160*a(n-37) +25842267261627269120*a(n-38) -34107186182096945152*a(n-39) -4415342928520544256*a(n-40) +6996913767166509056*a(n-41) +301538864894312448*a(n-42) -530404409239142400*a(n-43) for n>47

%e Some solutions for n=4

%e ..0..0..1..1..1..1..1....1..1..0..0..0..1..0....1..0..0..0..0..0..1

%e ..1..0..0..0..0..0..0....0..0..0..0..0..0..0....1..0..1..0..1..0..1

%e ..1..0..1..0..1..1..1....0..0..1..0..0..0..1....1..0..1..0..1..0..1

%e ..1..0..1..0..1..1..1....1..0..0..0..0..0..1....1..0..0..0..1..0..1

%e ..0..0..0..0..0..0..0....0..0..0..1..1..0..0....1..0..0..0..1..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 17 2012

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)