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A251502 Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock summing to 3 4 5 6 7 8 or 9 1

%I #4 Dec 03 2014 16:48:11

%S 46684,8888108,1690296520,321542579960,61166220193608,

%T 11635518782310748,2213399667918018212,421050257777346452044,

%U 80095484818168911728744,15236391786608500880488640,2898386035130075160852188416

%N Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock summing to 3 4 5 6 7 8 or 9

%C Column 3 of A251507

%H R. H. Hardin, <a href="/A251502/b251502.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 176*a(n-1) +3413*a(n-2) -125368*a(n-3) -1893835*a(n-4) +31887620*a(n-5) +383671423*a(n-6) -3761926180*a(n-7) -32966090516*a(n-8) +229001708843*a(n-9) +1199598095840*a(n-10) -7620825099547*a(n-11) -18334025296894*a(n-12) +134094810066991*a(n-13) +101964861959178*a(n-14) -1272714141069512*a(n-15) +167679506129788*a(n-16) +6828794272826786*a(n-17) -4517139075458763*a(n-18) -21186850802769324*a(n-19) +21769517946274164*a(n-20) +37623553221559518*a(n-21) -50857595797211666*a(n-22) -36218029513103592*a(n-23) +64465737148177844*a(n-24) +16050401329524120*a(n-25) -44585027008836960*a(n-26) -1242552442240032*a(n-27) +16129693977189952*a(n-28) -876331490995968*a(n-29) -2817620429663232*a(n-30) +142236267826176*a(n-31) +184652206460928*a(n-32)

%e Some solutions for n=1

%e ..3..3..0..3....1..1..1..1....0..1..3..0....0..3..2..0....1..1..1..2

%e ..2..0..0..0....3..2..3..2....1..1..1..1....1..0..3..3....3..2..1..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 03 2014

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Last modified September 5 05:06 EDT 2024. Contains 375686 sequences. (Running on oeis4.)