A277279 - cp's OEIS frontend

A277279 Somos-4 sequence variant: a(n) = (a(n-1) * a(n-3) - a(n-2)^2) / a(n-4), a(0) = 1, a(1) = 1, a(2) = 2, a(3) = -1.

n	a(n)
0	1
1	1
2	2
3	-1
4	-5
5	-11
6	-7
7	86
8	199
9	799
10	-4159
11	-17047
12	-155366
13	445015
14	7627979
15	81138437
16	142104721
17	-12357952274
18	-134098256401
19	-2117060496481
20	57564521075233
21	987319483194481
22	40297982292465650
23	-635283824578537969
24	-39106648195100243333

[1, 1, 2, -1, -5, -11, -7, 86, 199, 799, -4159, -17047, -155366, 445015, 7627979, 81138437, 142104721, -12357952274, -134098256401, -2117060496481, 57564521075233, 987319483194481, 40297982292465650, -635283824578537969, -39106648195100243333]

cp's OEIS Frontend

A277279 Somos-4 sequence variant: a(n) = (a(n-1) * a(n-3) - a(n-2)^2) / a(n-4), a(0) = 1, a(1) = 1, a(2) = 2, a(3) = -1.

Table of values

List of values