A360271 - cp's OEIS frontend

A360271 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-3k,k) Catalan(n-3*k).

n	a(n)
0	1
1	1
2	2
3	5
4	13
5	38
6	117
7	373
8	1222
9	4085
10	13877
11	47766
12	166229
13	583893
14	2067414
15	7371093
16	26440789
17	95355990
18	345538389
19	1257486165
20	4593933398
21	16841578325
22	61938532181
23	228454719830
24	844882459989
25	3132258655573
26	11638656376150
27	43337083401557

[1, 1, 2, 5, 13, 38, 117, 373, 1222, 4085, 13877, 47766, 166229, 583893, 2067414, 7371093, 26440789, 95355990, 345538389, 1257486165, 4593933398, 16841578325, 61938532181, 228454719830, 844882459989, 3132258655573, 11638656376150, 43337083401557]

cp's OEIS Frontend

A360271 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-3k,k) Catalan(n-3*k).

Table of values

List of values

cp's OEIS Frontend

A360271 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-3*k,k) * Catalan(n-3*k).

Table of values

List of values

A360271 a(n) = Sum_{k=0..floor(n/4)} (-1)^k * binomial(n-3k,k) Catalan(n-3*k).