A339240 - cp's OEIS frontend

A339240 a(n) = n2^(2n-2) + nbinomial(2n,n)/2.

n	a(n)
0	0
1	2
2	14
3	78
4	396
5	1910
6	8916
7	40684
8	182552
9	808614
10	3545220
11	15414212
12	66556584
13	285707708
14	1220340296
15	5189913240
16	21988512304
17	92850096902
18	390913863012
19	1641450064084
20	6876023427080
21	28741451864916
22	119902111845208
23	499304732388968
24	2075821104461136
25	8617006998238300

[0, 2, 14, 78, 396, 1910, 8916, 40684, 182552, 808614, 3545220, 15414212, 66556584, 285707708, 1220340296, 5189913240, 21988512304, 92850096902, 390913863012, 1641450064084, 6876023427080, 28741451864916, 119902111845208, 499304732388968, 2075821104461136, 8617006998238300]

cp's OEIS Frontend

A339240 a(n) = n2^(2n-2) + nbinomial(2n,n)/2.

Table of values

List of values

cp's OEIS Frontend

A339240 a(n) = n*2^(2*n-2) + n*binomial(2*n,n)/2.

Table of values

List of values

A339240 a(n) = n2^(2n-2) + nbinomial(2n,n)/2.