A253197 - cp's OEIS frontend

A253197 a(n) = a(n-1) + a(n-2) + (1 - (-1)^(a(n-1) + a(n-2))) with a(0) = 0, a(1) = 1.

n	a(n)
0	0
1	1
2	3
3	4
4	9
5	15
6	24
7	41
8	67
9	108
10	177
11	287
12	464
13	753
14	1219
15	1972
16	3193
17	5167
18	8360
19	13529
20	21891
21	35420
22	57313
23	92735
24	150048
25	242785
26	392835
27	635620
28	1028457
29	1664079
30	2692536
31	4356617
32	7049155
33	11405772
34	18454929
35	29860703
36	48315632
37	78176337
38	126491971
39	204668308
40	331160281
41	535828591
42	866988872

[0, 1, 3, 4, 9, 15, 24, 41, 67, 108, 177, 287, 464, 753, 1219, 1972, 3193, 5167, 8360, 13529, 21891, 35420, 57313, 92735, 150048, 242785, 392835, 635620, 1028457, 1664079, 2692536, 4356617, 7049155, 11405772, 18454929, 29860703, 48315632, 78176337, 126491971, 204668308, 331160281, 535828591, 866988872]

cp's OEIS Frontend

A253197 a(n) = a(n-1) + a(n-2) + (1 - (-1)^(a(n-1) + a(n-2))) with a(0) = 0, a(1) = 1.

Table of values

List of values