A072616 - cp's OEIS frontend

A072616 Number of essentially different ways of arranging numbers 1 through 2n around a circle so that the sum of each pair of adjacent numbers is prime and the odd (or even) numbers are in order.

n	a(n)
1	1
2	1
3	1
4	1
5	4
6	8
7	2
8	5
9	18
10	2
11	9
12	100
13	80
14	224
15	567
16	200
17	225
18	2535
19	1573
20	10890
21	132651
22	34476
23	79768
24	319740
25	42282
26	257337
27	3445032
28	4274240
29	36781568
30	260272120

[1, 1, 1, 1, 4, 8, 2, 5, 18, 2, 9, 100, 80, 224, 567, 200, 225, 2535, 1573, 10890, 132651, 34476, 79768, 319740, 42282, 257337, 3445032, 4274240, 36781568, 260272120]

cp's OEIS Frontend

A072616 Number of essentially different ways of arranging numbers 1 through 2n around a circle so that the sum of each pair of adjacent numbers is prime and the odd (or even) numbers are in order.

Table of values

List of values