A240607 - cp's OEIS frontend

A240607 a(n) = 2*a(n-2) + a(n-3) + a(n-4) for n>=4, a(n) = binomial(n,3) for n<4.

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	2
6	1
7	5
8	4
9	13
10	14
11	35
12	45
13	97
14	139
15	274
16	420
17	784
18	1253
19	2262
20	3710
21	6561
22	10935
23	19094
24	32141
25	55684
26	94311
27	162603
28	276447
29	475201
30	809808
31	1389452
32	2371264
33	4063913
34	6941788
35	11888542
36	20318753
37	34782785
38	59467836
39	101772865
40	174037210

[0, 0, 0, 1, 0, 2, 1, 5, 4, 13, 14, 35, 45, 97, 139, 274, 420, 784, 1253, 2262, 3710, 6561, 10935, 19094, 32141, 55684, 94311, 162603, 276447, 475201, 809808, 1389452, 2371264, 4063913, 6941788, 11888542, 20318753, 34782785, 59467836, 101772865, 174037210]

cp's OEIS Frontend

A240607 a(n) = 2*a(n-2) + a(n-3) + a(n-4) for n>=4, a(n) = binomial(n,3) for n<4.

Table of values

List of values