A123947 - cp's OEIS frontend

A123947 Expansion of x^2(1+x-x^2)/(1-2x-4*x^2+x^3+x^4).

n	a(n)
1	0
2	1
3	3
4	9
5	29
6	90
7	284
8	890
9	2797
10	8780
11	27574
12	86581
13	271881
14	853732
15	2680833
16	8418132
17	26433983
18	83005929
19	260648825
20	818469251
21	2570093890
22	8070410030
23	25342077544
24	79577232067
25	249882270390
26	784660981474
27	2463931734897

[0, 1, 3, 9, 29, 90, 284, 890, 2797, 8780, 27574, 86581, 271881, 853732, 2680833, 8418132, 26433983, 83005929, 260648825, 818469251, 2570093890, 8070410030, 25342077544, 79577232067, 249882270390, 784660981474, 2463931734897]

cp's OEIS Frontend

A123947 Expansion of x^2(1+x-x^2)/(1-2x-4*x^2+x^3+x^4).

Table of values

List of values

cp's OEIS Frontend

A123947 Expansion of x^2*(1+x-x^2)/(1-2*x-4*x^2+x^3+x^4).

Table of values

List of values

A123947 Expansion of x^2(1+x-x^2)/(1-2x-4*x^2+x^3+x^4).