A090166 -id:A090166 - cp's OEIS frontend

A090033 Triangle T(j,k) read by rows, where T(j,k) is the number of single tile moves in the longest optimal solution of the j X k generalization of the sliding block 15-puzzle, starting with the empty square in a corner.

0, 1, 6, 2, 21, 31, 3, 36, 53, 80, 4, 55, 84

Offset: 1

Hugo Pfoertner, Nov 23 2003

T(k,j) = T(j,k).

T(2,2), T(2,3), T(4,2), T(4,3) from Karlemo and Östergård, T(3,3) from Reinefeld, T(4,4) from Bruengger et al.

			The triangle begins
  0
  1   6
  2  21  31
  3  36  53  80
  4  55  84  ...
.
a(6)=T(3,3)=31 because the A090163(3,3)=2 longest optimal solution paths of the 3 X 3 (9-) sliding block puzzle have length 31 (see A089473).

For references and links see A087725(n)=T(n,n).

Cf. A087725, A089473, A089484, A090034, A090035, A090036, A090166, A090163 corresponding number of different configurations with largest distance.

Cf. A151944 same as this sequence, but written as full array.

# alst(), moves(), swap() in A089473
def T(j, k):  # chr(45) is '-'
    start, shape = "".join(chr(45+i) for i in range(j*k)), (j, k)
    return len(alst(start, shape))-1
for j in range(1, 5):
    for k in range(1, j+1):
        print(T(j,k), end=", ") # Michael S. Branicky, Aug 02 2021

T(5,3) copied from A151944 by Hugo Pfoertner, Aug 02 2021

A090036 Number of configurations of the 5 X 2 variant of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

Original entry on oeis.org

1, 2, 3, 6, 11, 19, 30, 44, 68, 112, 176, 271, 411, 602, 851, 1232, 1783, 2530, 3567, 4996, 6838, 9279, 12463, 16597, 21848, 28227, 35682, 44464, 54597, 65966, 78433, 91725, 104896, 116966, 126335, 131998, 133107, 128720, 119332, 106335, 91545, 75742, 60119, 45840, 33422, 23223, 15140, 9094, 5073, 2605, 1224, 528, 225, 75, 20, 2

Offset: 0

Hugo Pfoertner, Nov 27 2003

			Starting from
12345
6789-
the 2 most distant configurations corresponding to a(55)=2 are
-9371 and -5321
54826.....94876

Hugo Pfoertner, Solutions of small n*2 sliding block puzzles.
Takaken, 11-Puzzle Page.
Takaken, No. 52 (9 puzzles).

Cf. A087725, A089473. Index of last sequence term: A090033. Other nonsquare sliding block puzzles: A090034, A090035, A090166, A090167.

# alst(), moves(), swap() in A089473
print(alst("-123456789", (5, 2))) # Michael S. Branicky, Dec 30 2020

A090035 Number of configurations of the 4 X 2 variant of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

Original entry on oeis.org

1, 2, 3, 6, 10, 14, 19, 28, 42, 61, 85, 119, 161, 215, 293, 396, 506, 632, 788, 985, 1194, 1414, 1664, 1884, 1999, 1958, 1770, 1463, 1076, 667, 361, 190, 88, 39, 19, 7, 1

Offset: 0

Hugo Pfoertner, Nov 26 2003

Data from Karlemo, Östergård. See corresponding link in A087725.

			Starting from
1234
567-
the most distant configuration corresponding to a(36)=1 is
-721
4365

See A087725.

Hugo Pfoertner, Solutions of small n*2 sliding block puzzles.
Takaken, n-Puzzle Page.
Takaken, No. 42 (7 puzzles).

Cf. A087725, A089473. Index of last sequence term: A090033. Other nonsquare sliding block puzzles: A090034, A090036, A090166, A090167.

# alst(), moves(), swap() in A089473
print(alst("-1234567", (4, 2))) # Michael S. Branicky, Dec 30 2020

A090167 Number of configurations of the 6 X 2 variant of the so-called "Sam Loyd" sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

Original entry on oeis.org

1, 2, 3, 6, 11, 20, 36, 60, 95, 155, 258, 426, 688, 1106, 1723, 2615, 3901, 5885, 8851, 13205, 19508, 28593, 41179, 58899, 83582, 118109, 165136, 228596, 312542, 423797, 568233, 755727, 994641, 1296097, 1667002, 2119476, 2660415, 3300586, 4038877

Offset: 0

Hugo Pfoertner, Nov 27 2003

Herman Jamke, Table of n, a(n) for n = 0..80 (complete sequence)
Hugo Pfoertner, Solutions of small n*2 sliding block puzzles.
Takaken, 11-Puzzle Page.
Takaken, No. 62 (11 puzzles).

Cf. A087725, A089473. Index of last sequence term: A090033. Other nonsquare sliding block puzzles: A090034, A090035, A090036, A090166.

# alst(), moves(), swap() in A089473
alst("-123456789AB", (6, 2), v=True) # Michael S. Branicky, Dec 31 2020

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Oct 22 2006

A346737 Number of configurations of the 5 X 3 variant of the sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

Original entry on oeis.org

1, 2, 4, 9, 21, 42, 89, 164, 349, 644, 1349, 2473, 5109, 9110, 18489, 32321, 64962, 112445, 223153, 378761, 740095, 1231589, 2364342, 3847629, 7246578, 11506172, 21233764, 32854049, 59293970, 89146163, 157015152, 228894783, 392648931, 553489877, 922382155

Offset: 0

Ben Whitmore, Jul 31 2021

This sequence was originally computed by Richard Korf, but the full sequence was not included in his paper. It was later re-computed by Tomas Rokicki.

			Starting from the solved configuration
   1  2  3  4  5
   6  7  8  9 10
  11 12 13 14
the unique configuration requiring 84 moves is
   5  4  3  2  1
  10  9  8  7  6
     14 13 12 11

Ben Whitmore, Table of n, a(n) for n = 0..84
Richard Korf, Linear-time Disk-Based Implicit Graph Search, Journal of the ACM 55 (2008), No. 6.
Tomas Rokicki, Twenty-Four puzzle, some observations, 2011.

Cf. A090033, A090034, A090035, A090036, A090167, A346736, A090166, A089473, A089484.

# alst(), moves(), swap() in A089473
print(alst("-123456789abcde", (5, 3), v=True)) # Michael S. Branicky, Jul 31 2021

cp's OEIS Frontend

A090033 Triangle T(j,k) read by rows, where T(j,k) is the number of single tile moves in the longest optimal solution of the j X k generalization of the sliding block 15-puzzle, starting with the empty square in a corner.

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A090036 Number of configurations of the 5 X 2 variant of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

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A090035 Number of configurations of the 4 X 2 variant of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

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A090167 Number of configurations of the 6 X 2 variant of the so-called "Sam Loyd" sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

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A346737 Number of configurations of the 5 X 3 variant of the sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Python