A124753 - cp's OEIS frontend

A124753 a(3n+k) = (k+1)*binomial(4n+k, n)/(3n+k+1), where k is n reduced mod 3.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	3
6	4
7	9
8	15
9	22
10	52
11	91
12	140
13	340
14	612
15	969
16	2394
17	4389
18	7084
19	17710
20	32890
21	53820
22	135720
23	254475
24	420732
25	1068012
26	2017356
27	3362260
28	8579560
29	16301164
30	27343888
31	70068713
32	133767543
33	225568798
34	580034052
35	1111731933
36	1882933364
37	4855986044
38	9338434700

[1, 1, 1, 1, 2, 3, 4, 9, 15, 22, 52, 91, 140, 340, 612, 969, 2394, 4389, 7084, 17710, 32890, 53820, 135720, 254475, 420732, 1068012, 2017356, 3362260, 8579560, 16301164, 27343888, 70068713, 133767543, 225568798, 580034052, 1111731933, 1882933364, 4855986044, 9338434700]

cp's OEIS Frontend

A124753 a(3n+k) = (k+1)*binomial(4n+k, n)/(3n+k+1), where k is n reduced mod 3.

Table of values

List of values