A083309 - cp's OEIS frontend

A083309 a(n) is the number of times that sums 3 +- 5 +- 7 +- 11 +- ... +- prime(2n+1) of the first 2n odd primes is zero. There are 2^(2n-1) choices for the sign patterns.

n	a(n)
1	0
2	0
3	1
4	2
5	7
6	19
7	63
8	197
9	645
10	2172
11	7423
12	25534
13	89218
14	317284
15	1130526
16	4033648
17	14515742
18	52625952
19	191790090
20	702333340
21	2585539586
22	9570549372
23	35562602950
24	131774529663
25	491713178890
26	1842214901398
27	6909091641548

[0, 0, 1, 2, 7, 19, 63, 197, 645, 2172, 7423, 25534, 89218, 317284, 1130526, 4033648, 14515742, 52625952, 191790090, 702333340, 2585539586, 9570549372, 35562602950, 131774529663, 491713178890, 1842214901398, 6909091641548]

cp's OEIS Frontend

A083309 a(n) is the number of times that sums 3 +- 5 +- 7 +- 11 +- ... +- prime(2n+1) of the first 2n odd primes is zero. There are 2^(2n-1) choices for the sign patterns.

Table of values

List of values