A351969 - cp's OEIS frontend

A351969 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/4)} binomial(n-1,4k) a(k) * a(n-4*k-1).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	7
7	22
8	57
9	128
10	389
11	1904
12	9329
13	38040
14	132147
15	542648
16	3283633
17	20997824
18	114657097
19	536178880
20	2784500161
21	19876061313
22	153326461333
23	1034551840125
24	6051063487505
25	38079448058864
26	312420426286609
27	2785055245002944
28	22141255546319849

[1, 1, 1, 1, 1, 2, 7, 22, 57, 128, 389, 1904, 9329, 38040, 132147, 542648, 3283633, 20997824, 114657097, 536178880, 2784500161, 19876061313, 153326461333, 1034551840125, 6051063487505, 38079448058864, 312420426286609, 2785055245002944, 22141255546319849]

cp's OEIS Frontend

A351969 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/4)} binomial(n-1,4k) a(k) * a(n-4*k-1).

Table of values

List of values

cp's OEIS Frontend

A351969 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/4)} binomial(n-1,4*k) * a(k) * a(n-4*k-1).

Table of values

List of values

A351969 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/4)} binomial(n-1,4k) a(k) * a(n-4*k-1).