A360272 - cp's OEIS frontend

A360272 a(n) = Sum_{k=0..floor(n/4)} binomial(n-3k,k) Catalan(n-3*k).

n	a(n)
0	1
1	1
2	2
3	5
4	15
5	46
6	147
7	485
8	1642
9	5669
10	19883
11	70646
12	253755
13	919925
14	3361546
15	12368661
16	45786219
17	170400470
18	637200555
19	2392962645
20	9021255722
21	34128098389
22	129519490219
23	492966689110
24	1881289209003
25	7197100511317
26	27595769836714
27	106032318322517

[1, 1, 2, 5, 15, 46, 147, 485, 1642, 5669, 19883, 70646, 253755, 919925, 3361546, 12368661, 45786219, 170400470, 637200555, 2392962645, 9021255722, 34128098389, 129519490219, 492966689110, 1881289209003, 7197100511317, 27595769836714, 106032318322517]

cp's OEIS Frontend

A360272 a(n) = Sum_{k=0..floor(n/4)} binomial(n-3k,k) Catalan(n-3*k).

Table of values

List of values

cp's OEIS Frontend

A360272 a(n) = Sum_{k=0..floor(n/4)} binomial(n-3*k,k) * Catalan(n-3*k).

Table of values

List of values

A360272 a(n) = Sum_{k=0..floor(n/4)} binomial(n-3k,k) Catalan(n-3*k).