A210672 - cp's OEIS frontend

A210672 a(0)=1; thereafter a(n) = 2Sum_{k=1..n} binomial(2n,2k)a(n-k).

n	a(n)
0	1
1	2
2	26
3	842
4	50906
5	4946282
6	704888186
7	138502957322
8	35887046307866
9	11855682722913962
10	4863821092813045946
11	2425978759725443056202
12	1445750991051368583278426
13	1014551931766896667943384042
14	828063237870027116855857421306
15	777768202388460616924079724057482

[1, 2, 26, 842, 50906, 4946282, 704888186, 138502957322, 35887046307866, 11855682722913962, 4863821092813045946, 2425978759725443056202, 1445750991051368583278426, 1014551931766896667943384042, 828063237870027116855857421306, 777768202388460616924079724057482]

cp's OEIS Frontend

A210672 a(0)=1; thereafter a(n) = 2Sum_{k=1..n} binomial(2n,2k)a(n-k).

Table of values

List of values

cp's OEIS Frontend

A210672 a(0)=1; thereafter a(n) = 2*Sum_{k=1..n} binomial(2n,2k)*a(n-k).

Table of values

List of values

A210672 a(0)=1; thereafter a(n) = 2Sum_{k=1..n} binomial(2n,2k)a(n-k).