A090164 - cp's OEIS frontend

A090164 Number of configurations of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square at one of the 4 central squares.

n	a(n)
0	1
1	4
2	10
3	20
4	38
5	80
6	174
7	372
8	762
9	1540
10	3072
11	6196
12	12356
13	24516
14	48179
15	94356
16	183432
17	355330
18	682250
19	1301874
20	2460591
21	4617322
22	8580175
23	15815664
24	28854386
25	52154316
26	93214030

[1, 4, 10, 20, 38, 80, 174, 372, 762, 1540, 3072, 6196, 12356, 24516, 48179, 94356, 183432, 355330, 682250, 1301874, 2460591, 4617322, 8580175, 15815664, 28854386, 52154316, 93214030]

cp's OEIS Frontend

A090164 Number of configurations of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square at one of the 4 central squares.

Table of values

List of values