A331520 - cp's OEIS frontend

A331520 a(0) = a(1) = 1; a(n+2) = Sum_{k=0..n} (binomial(n,k) mod 2) * a(k).

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	5
6	3
7	9
8	7
9	24
10	8
11	33
12	17
13	77
14	27
15	134
16	66
17	351
18	67
19	419
20	135
21	908
22	204
23	1469
24	479
25	3643
26	553
27	4572
28	1182
29	10227
30	1889
31	17125
32	4641
33	43640
34	4642
35	48283
36	9285
37	101211
38	13929
39	158786
40	32504
41	384441
42	37153
43	465259
44	78957
45	1020640
46	125414
47	1675453

[1, 1, 1, 2, 2, 5, 3, 9, 7, 24, 8, 33, 17, 77, 27, 134, 66, 351, 67, 419, 135, 908, 204, 1469, 479, 3643, 553, 4572, 1182, 10227, 1889, 17125, 4641, 43640, 4642, 48283, 9285, 101211, 13929, 158786, 32504, 384441, 37153, 465259, 78957, 1020640, 125414, 1675453]

cp's OEIS Frontend

A331520 a(0) = a(1) = 1; a(n+2) = Sum_{k=0..n} (binomial(n,k) mod 2) * a(k).

Table of values

List of values