A210674 - cp's OEIS frontend

A210674 a(0)=1; thereafter a(n) = 3Sum_{k=1..n} binomial(2n,2k)a(n-k).

n	a(n)
0	1
1	3
2	57
3	2703
4	239277
5	34041603
6	7103141697
7	2043564786903
8	775293596155317
9	375019773885750603
10	225270492555606688137
11	164517775480287009524703
12	143555042043378357951428157
13	147502150365016885913874781203
14	176273363579960990244526939543377
15	242422256082395157286909073370272103

[1, 3, 57, 2703, 239277, 34041603, 7103141697, 2043564786903, 775293596155317, 375019773885750603, 225270492555606688137, 164517775480287009524703, 143555042043378357951428157, 147502150365016885913874781203, 176273363579960990244526939543377, 242422256082395157286909073370272103]

cp's OEIS Frontend

A210674 a(0)=1; thereafter a(n) = 3Sum_{k=1..n} binomial(2n,2k)a(n-k).

Table of values

List of values

cp's OEIS Frontend

A210674 a(0)=1; thereafter a(n) = 3*Sum_{k=1..n} binomial(2n,2k)*a(n-k).

Table of values

List of values

A210674 a(0)=1; thereafter a(n) = 3Sum_{k=1..n} binomial(2n,2k)a(n-k).