A333497 - cp's OEIS frontend

A333497 a(0) = a(1) = a(2) = 1; a(n) = Sum_{k=0..n-3} binomial(n-3,k) * a(k) * a(n-k-3).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	4
6	8
7	18
8	48
9	144
10	456
11	1560
12	5808
13	23184
14	98160
15	440832
16	2101824
17	10588608
18	56104128
19	312013440
20	1818498816
21	11082682368
22	70467474816
23	466680045312
24	3214497245184
25	22994283345408
26	170573216656896
27	1310482565462016
28	10415453732637696

[1, 1, 1, 1, 2, 4, 8, 18, 48, 144, 456, 1560, 5808, 23184, 98160, 440832, 2101824, 10588608, 56104128, 312013440, 1818498816, 11082682368, 70467474816, 466680045312, 3214497245184, 22994283345408, 170573216656896, 1310482565462016, 10415453732637696]

cp's OEIS Frontend

A333497 a(0) = a(1) = a(2) = 1; a(n) = Sum_{k=0..n-3} binomial(n-3,k) * a(k) * a(n-k-3).

Table of values

List of values