A333564 - cp's OEIS frontend

A333564 a(n) = [x^n] ( c(x)/c(-x) )^n, where c(x) = (1 - sqrt( 1 - 4x))/(2x) is the o.g.f. of the Catalan numbers A000108.

n	a(n)
1	2
2	8
3	56
4	384
5	2752
6	20096
7	148864
8	1114112
9	8403968
10	63787008
11	486584320
12	3727196160
13	28649455616
14	220869853184
15	1707123245056
16	13223868760064
17	102636144295936
18	797982357192704
19	6213784327684096
20	48452953790480384
21	378291752487878656
22	2956824500391378944

[2, 8, 56, 384, 2752, 20096, 148864, 1114112, 8403968, 63787008, 486584320, 3727196160, 28649455616, 220869853184, 1707123245056, 13223868760064, 102636144295936, 797982357192704, 6213784327684096, 48452953790480384, 378291752487878656, 2956824500391378944]

cp's OEIS Frontend

A333564 a(n) = [x^n] ( c(x)/c(-x) )^n, where c(x) = (1 - sqrt( 1 - 4x))/(2x) is the o.g.f. of the Catalan numbers A000108.

Table of values

List of values

cp's OEIS Frontend

A333564 a(n) = [x^n] ( c(x)/c(-x) )^n, where c(x) = (1 - sqrt( 1 - 4*x))/(2*x) is the o.g.f. of the Catalan numbers A000108.

Table of values

List of values

A333564 a(n) = [x^n] ( c(x)/c(-x) )^n, where c(x) = (1 - sqrt( 1 - 4x))/(2x) is the o.g.f. of the Catalan numbers A000108.