A345103 - cp's OEIS frontend

A345103 a(n) = 1 + 4 * Sum_{k=0..n-1} binomial(n,k) * a(k) * a(n-k-1).

n	a(n)
0	1
1	5
2	61
3	1277
4	37741
5	1437725
6	67013101
7	3693540317
8	234974905261
9	16945434018845
10	1366008048556141
11	121721015465713757
12	11880107754103150381
13	1260413749895624939165
14	144427420001275864755181
15	17776090894283922227621597
16	2338833689096321086977341101
17	327585830473259220341296486685

[1, 5, 61, 1277, 37741, 1437725, 67013101, 3693540317, 234974905261, 16945434018845, 1366008048556141, 121721015465713757, 11880107754103150381, 1260413749895624939165, 144427420001275864755181, 17776090894283922227621597, 2338833689096321086977341101, 327585830473259220341296486685]

cp's OEIS Frontend

A345103 a(n) = 1 + 4 * Sum_{k=0..n-1} binomial(n,k) * a(k) * a(n-k-1).

Table of values

List of values