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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
46684, 8888108, 1690296520, 321542579960, 61166220193608, 11635518782310748, 2213399667918018212, 421050257777346452044, 80095484818168911728744, 15236391786608500880488640, 2898386035130075160852188416 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A251507
LINKS
FORMULA
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)
EXAMPLE
Some solutions for n=1
..3..3..0..3....1..1..1..1....0..1..3..0....0..3..2..0....1..1..1..2
..2..0..0..0....3..2..3..2....1..1..1..1....1..0..3..3....3..2..1..1
CROSSREFS
Sequence in context: A355307 A265285 A255514 * A052359 A205752 A205474
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 03 2014
STATUS
approved

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)