A376113 - cp's OEIS frontend

A376113 a(0) = 1; a(n) = (1/3) * Sum_{k=1..n} (4^k-1) * a(k-1) * a(n-k).

n	a(n)
0	1
1	1
2	6
3	137
4	11938
5	4095882
6	5599192492
7	30588428274345
8	668265444025582410
9	58395039572032120897838
10	20410643002515607839683651348
11	28536181214271796693200339702494058
12	159585939576145805663910944364491926768148
13	3569877304419418296304606194938539586766279745396

[1, 1, 6, 137, 11938, 4095882, 5599192492, 30588428274345, 668265444025582410, 58395039572032120897838, 20410643002515607839683651348, 28536181214271796693200339702494058, 159585939576145805663910944364491926768148, 3569877304419418296304606194938539586766279745396]

cp's OEIS Frontend

A376113 a(0) = 1; a(n) = (1/3) * Sum_{k=1..n} (4^k-1) * a(k-1) * a(n-k).

Table of values

List of values