A000348 - cp's OEIS frontend

A000348 Number of ways to pair up {1^2, 2^2, ..., (2n)^2 } so sum of each pair is prime.

n	a(n)
1	1
2	1
3	2
4	4
5	12
6	9
7	72
8	160
9	428
10	2434
11	3011
12	10337
13	126962
14	264182
15	783550
16	5004266
17	34340141
18	176302123
19	1188146567
20	4457147441
21	7845512385
22	132253267889
23	1004345333251
24	3865703506342
25	40719018858150
26	213982561376958
27	1266218151414286
28	10976172953868304
29	59767467676582641
30	512279001476451101
31	6189067229056357433

[1, 1, 2, 4, 12, 9, 72, 160, 428, 2434, 3011, 10337, 126962, 264182, 783550, 5004266, 34340141, 176302123, 1188146567, 4457147441, 7845512385, 132253267889, 1004345333251, 3865703506342, 40719018858150, 213982561376958, 1266218151414286, 10976172953868304, 59767467676582641, 512279001476451101, 6189067229056357433]

cp's OEIS Frontend

A000348 Number of ways to pair up {1^2, 2^2, ..., (2n)^2 } so sum of each pair is prime.

Table of values

List of values