A322185 - cp's OEIS frontend

A322185 a(n) = sigma(2n) binomial(2*n,n)/2, for n >= 1.

n	a(n)
1	3
2	21
3	120
4	525
5	2268
6	12936
7	41184
8	199485
9	948090
10	3879876
11	12697776
12	81124680
13	218412600
14	1123264800
15	5584230720
16	18934032285
17	63007367940
18	412918656150
19	1060357914000
20	6203093796900
21	25836377973120
22	88372156476240
23	296403506193600
24	1999351428352200
25	5878093199355468
26	24300008114457096
27	116816365538886720
28	458921436045626400
29	1353026992479346800

[3, 21, 120, 525, 2268, 12936, 41184, 199485, 948090, 3879876, 12697776, 81124680, 218412600, 1123264800, 5584230720, 18934032285, 63007367940, 412918656150, 1060357914000, 6203093796900, 25836377973120, 88372156476240, 296403506193600, 1999351428352200, 5878093199355468, 24300008114457096, 116816365538886720, 458921436045626400, 1353026992479346800]

cp's OEIS Frontend

A322185 a(n) = sigma(2n) binomial(2*n,n)/2, for n >= 1.

Table of values

List of values

cp's OEIS Frontend

A322185 a(n) = sigma(2*n) * binomial(2*n,n)/2, for n >= 1.

Table of values

List of values

A322185 a(n) = sigma(2n) binomial(2*n,n)/2, for n >= 1.