A071723 - cp's OEIS frontend

A071723 Expansion of (1+x^2C^2)C^4, where C = (1-(1-4x)^(1/2))/(2x) is g.f. for Catalan numbers, A000108.

n	a(n)
0	1
1	4
2	15
3	54
4	192
5	682
6	2431
7	8710
8	31382
9	113696
10	414086
11	1515516
12	5571750
13	20569590
14	76228095
15	283481670
16	1057628550
17	3957577800
18	14849601090
19	55859886420
20	210622646520
21	795898303668
22	3013646759910
23	11432740177564
24	43448822603452
25	165396657221152

[1, 4, 15, 54, 192, 682, 2431, 8710, 31382, 113696, 414086, 1515516, 5571750, 20569590, 76228095, 283481670, 1057628550, 3957577800, 14849601090, 55859886420, 210622646520, 795898303668, 3013646759910, 11432740177564, 43448822603452, 165396657221152]

cp's OEIS Frontend

A071723 Expansion of (1+x^2C^2)C^4, where C = (1-(1-4x)^(1/2))/(2x) is g.f. for Catalan numbers, A000108.

Table of values

List of values

cp's OEIS Frontend

A071723 Expansion of (1+x^2*C^2)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

Table of values

List of values

A071723 Expansion of (1+x^2C^2)C^4, where C = (1-(1-4x)^(1/2))/(2x) is g.f. for Catalan numbers, A000108.