A136029 - cp's OEIS frontend

A136029 a(n) is the number of central ideals of a garland of order 2n, i.e., a(n) = g(2n,n), where g(n,k) is the number of ideals of size k in a garland (or double fence) of order n (see A137278).

n	a(n)
0	1
1	1
2	1
3	3
4	7
5	15
6	33
7	75
8	171
9	391
10	899
11	2077
12	4815
13	11195
14	26097
15	60975
16	142751
17	334791
18	786419
19	1849905
20	4357121
21	10274313
22	24252923
23	57305241
24	135521807
25	320758587
26	759757139
27	1800838381
28	4271267043
29	10136815015
30	24070870545

[1, 1, 1, 3, 7, 15, 33, 75, 171, 391, 899, 2077, 4815, 11195, 26097, 60975, 142751, 334791, 786419, 1849905, 4357121, 10274313, 24252923, 57305241, 135521807, 320758587, 759757139, 1800838381, 4271267043, 10136815015, 24070870545]

cp's OEIS Frontend

A136029 a(n) is the number of central ideals of a garland of order 2n, i.e., a(n) = g(2n,n), where g(n,k) is the number of ideals of size k in a garland (or double fence) of order n (see A137278).

Table of values

List of values