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 A235093 Number of (n+1) X (3+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1
 808, 1728, 3832, 9460, 23792, 63884, 173440, 491596, 1403944, 4134548, 12235728, 37057844, 112505216, 347784756, 1075280328, 3373236492, 10564408720, 33488371740, 105827385472, 337928612524, 1074606972584, 3449111677268 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A235098. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 7*a(n-1) +20*a(n-2) -239*a(n-3) +36*a(n-4) +3285*a(n-5) -4086*a(n-6) -23439*a(n-7) +45882*a(n-8) +91959*a(n-9) -251226*a(n-10) -184209*a(n-11) +783240*a(n-12) +99087*a(n-13) -1431666*a(n-14) +277611*a(n-15) +1499767*a(n-16) -513754*a(n-17) -855386*a(n-18) +293540*a(n-19) +256932*a(n-20) -54600*a(n-21) -32760*a(n-22). EXAMPLE Some solutions for n=4: 3 4 3 4 3 2 3 4 3 5 2 3 4 2 1 0 3 2 3 2 4 1 4 1 5 0 5 2 4 2 3 0 3 5 0 3 2 5 2 5 3 4 3 4 3 2 3 4 2 4 1 2 4 2 1 0 4 3 4 3 0 5 0 5 0 3 0 5 4 2 3 0 3 5 0 3 2 5 2 5 3 4 3 4 2 1 2 3 2 4 1 2 4 2 1 0 5 4 5 4 CROSSREFS Column 3 of A235098. Sequence in context: A252523 A243858 A252682 * A259959 A332180 A160034 Adjacent sequences: A235090 A235091 A235092 * A235094 A235095 A235096 KEYWORD nonn AUTHOR R. H. Hardin, Jan 03 2014 STATUS approved

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Last modified November 30 15:21 EST 2022. Contains 358442 sequences. (Running on oeis4.)