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A236496 Number of (n+1)X(2+1) 0..3 arrays colored with the sum of the maximum and minimum values of each 2X2 subblock 1
2228, 30916, 404844, 5217808, 67922876, 889064156, 11593920636, 150933818096, 1967718157060, 25666289129712, 334603096750484, 4361467934769740, 56861946338785396, 741358063588817148, 9665019767331628236 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236500

LINKS

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

FORMULA

Empirical: a(n) = 62*a(n-2) +725*a(n-3) +7415*a(n-4) +25938*a(n-5) -43654*a(n-6) -497122*a(n-7) -870235*a(n-8) +1383538*a(n-9) +6711678*a(n-10) +7323747*a(n-11) -4082728*a(n-12) -31886496*a(n-13) -47300006*a(n-14) -12535262*a(n-15) +22727505*a(n-16) +103868945*a(n-17) +241224605*a(n-18) -129769422*a(n-19) -357137862*a(n-20) +318197576*a(n-21) +757875482*a(n-22) +1291333264*a(n-23) +422581272*a(n-24) -2833137215*a(n-25) -4398569896*a(n-26) -2785178278*a(n-27) +32869089*a(n-28) +2214404517*a(n-29) +1044738288*a(n-30) -2794241155*a(n-31) -5865396108*a(n-32) -5446738798*a(n-33) -2850201776*a(n-34) -687819008*a(n-35) -18405064*a(n-36) -19215173*a(n-37) -16345608*a(n-38) +621997*a(n-39) +1385329*a(n-40) -452750*a(n-41) +65418*a(n-42) -2720*a(n-43) for n>46

EXAMPLE

Some solutions for n=2

..3..2..1....2..1..0....1..3..2....1..0..3....3..2..1....2..1..1....0..3..2

..2..2..1....3..2..3....3..3..2....2..1..2....2..1..1....0..2..2....3..1..3

..1..2..0....0..1..2....0..1..2....1..2..3....2..0..0....3..3..2....2..3..0

CROSSREFS

Sequence in context: A053395 A178919 A205225 * A208181 A252644 A205046

Adjacent sequences:  A236493 A236494 A236495 * A236497 A236498 A236499

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2014

STATUS

approved

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Last modified October 21 02:29 EDT 2021. Contains 348141 sequences. (Running on oeis4.)