A375972 - cp's OEIS frontend

A375972 a(n) = binomial(n,k(n)), where k(2) = 1, k(n) = k(n-1) + (a(n-1) mod 2).

n	a(n)
2	2
3	3
4	6
5	10
6	15
7	35
8	70
9	126
10	210
11	330
12	495
13	1287
14	3003
15	6435
16	12870
17	24310
18	43758
19	75582
20	125970
21	203490
22	319770
23	490314
24	735471
25	2042975
26	5311735
27	13037895
28	30421755
29	67863915
30	145422675
31	300540195
32	601080390
33	1166803110
34	2203961430
35	4059928950
36	7307872110
37	12875774670
38	22239974430

[2, 3, 6, 10, 15, 35, 70, 126, 210, 330, 495, 1287, 3003, 6435, 12870, 24310, 43758, 75582, 125970, 203490, 319770, 490314, 735471, 2042975, 5311735, 13037895, 30421755, 67863915, 145422675, 300540195, 601080390, 1166803110, 2203961430, 4059928950, 7307872110, 12875774670, 22239974430]

cp's OEIS Frontend

A375972 a(n) = binomial(n,k(n)), where k(2) = 1, k(n) = k(n-1) + (a(n-1) mod 2).

Table of values

List of values