A385319 - cp's OEIS frontend

A385319 a(n) = Sum_{k=0..n} 2^k * binomial(2n,k) binomial(2*n-k-1,n-k).

n	a(n)
0	1
1	5
2	43
3	422
4	4387
5	47090
6	515854
7	5731052
8	64330531
9	727812026
10	8285505178
11	94798502804
12	1089146648206
13	12556967516852
14	145201851788092
15	1683334752235352
16	19558532125813027
17	227694254392461962
18	2655343386035416162
19	31014205667706302852
20	362746369474101224602

[1, 5, 43, 422, 4387, 47090, 515854, 5731052, 64330531, 727812026, 8285505178, 94798502804, 1089146648206, 12556967516852, 145201851788092, 1683334752235352, 19558532125813027, 227694254392461962, 2655343386035416162, 31014205667706302852, 362746369474101224602]

cp's OEIS Frontend

A385319 a(n) = Sum_{k=0..n} 2^k * binomial(2n,k) binomial(2*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A385319 a(n) = Sum_{k=0..n} 2^k * binomial(2*n,k) * binomial(2*n-k-1,n-k).

Table of values

List of values

A385319 a(n) = Sum_{k=0..n} 2^k * binomial(2n,k) binomial(2*n-k-1,n-k).