A054687 - cp's OEIS frontend

A054687 a(n+1) = 1 + Sum_{k=0..n} binomial(n,k)a(k)a(n-k) for n >= 0 with a(0) = 1.

n	a(n)
0	1
1	2
2	5
3	19
4	99
5	653
6	5187
7	48117
8	510271
9	6088301
10	80716427
11	1177130893
12	18727404639
13	322769897573
14	5990916997611
15	119139798166245
16	2527255556219167
17	56960055683893853
18	1359299747696197931
19	34240584053654816797
20	907911436336049691519
21	25277557586594907583733
22	737276033151104902965963

[1, 2, 5, 19, 99, 653, 5187, 48117, 510271, 6088301, 80716427, 1177130893, 18727404639, 322769897573, 5990916997611, 119139798166245, 2527255556219167, 56960055683893853, 1359299747696197931, 34240584053654816797, 907911436336049691519, 25277557586594907583733, 737276033151104902965963]

cp's OEIS Frontend

A054687 a(n+1) = 1 + Sum_{k=0..n} binomial(n,k)a(k)a(n-k) for n >= 0 with a(0) = 1.

Table of values

List of values

cp's OEIS Frontend

A054687 a(n+1) = 1 + Sum_{k=0..n} binomial(n,k)*a(k)*a(n-k) for n >= 0 with a(0) = 1.

Table of values

List of values

A054687 a(n+1) = 1 + Sum_{k=0..n} binomial(n,k)a(k)a(n-k) for n >= 0 with a(0) = 1.