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 A264508 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,1 0,-1 0,1 or 1,0. 1
 2, 2, 14, 38, 137, 432, 1417, 4554, 14710, 47394, 152762, 492284, 1586369, 5112128, 16473473, 53085636, 171065674, 551254626, 1776394534, 5724372546, 18446568521, 59443412528, 191554172489, 617276369198, 1989150291038, 6409964077506 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A264506. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +7*a(n-2) -8*a(n-3) -9*a(n-4) +10*a(n-5) -a(n-6) +a(n-8) -10*a(n-9) +9*a(n-10) +8*a(n-11) -7*a(n-12) -2*a(n-13) +a(n-14) EXAMPLE Some solutions for n=4 ..1..0..3..4..8....1..2..3..7..8....1..2..6..4..3....1..2..6..4..3 ..6.10..2..7.13....0.10.11.12..4....0..7.11.12..8....0..7..8.12.13 ..5.12.11.14..9....5..6.13.14..9....5.10.13.14..9....5.10.11.14..9 CROSSREFS Cf. A264506. Sequence in context: A151437 A235349 A226157 * A194689 A277556 A321179 Adjacent sequences: A264505 A264506 A264507 * A264509 A264510 A264511 KEYWORD nonn AUTHOR R. H. Hardin, Nov 15 2015 STATUS approved

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Last modified March 21 18:35 EDT 2023. Contains 361410 sequences. (Running on oeis4.)