A172393 - cp's OEIS frontend

A172393 G.f. satisfies: A(x) = G(x/A(x)^2) and G(x) = A(xG(x)^2) = Sum_{n>=0} C(2n,n)C(2n+2,n+1)/(n+2)*x^n is the g.f. of A172392.

n	a(n)
0	1
1	4
2	-2
3	8
4	-20
5	96
6	-324
7	1648
8	-6348
9	33200
10	-137848
11	732640
12	-3193296
13	17148608
14	-77335400
15	418289696
16	-1934677436
17	10518803376
18	-49611450120
19	270796872160
20	-1297234193744
21	7102371571840
22	-34458382484976
23	189117499963840

[1, 4, -2, 8, -20, 96, -324, 1648, -6348, 33200, -137848, 732640, -3193296, 17148608, -77335400, 418289696, -1934677436, 10518803376, -49611450120, 270796872160, -1297234193744, 7102371571840, -34458382484976, 189117499963840]

cp's OEIS Frontend

A172393 G.f. satisfies: A(x) = G(x/A(x)^2) and G(x) = A(xG(x)^2) = Sum_{n>=0} C(2n,n)C(2n+2,n+1)/(n+2)*x^n is the g.f. of A172392.

Table of values

List of values

cp's OEIS Frontend

A172393 G.f. satisfies: A(x) = G(x/A(x)^2) and G(x) = A(x*G(x)^2) = Sum_{n>=0} C(2n,n)*C(2n+2,n+1)/(n+2)*x^n is the g.f. of A172392.

Table of values

List of values

A172393 G.f. satisfies: A(x) = G(x/A(x)^2) and G(x) = A(xG(x)^2) = Sum_{n>=0} C(2n,n)C(2n+2,n+1)/(n+2)*x^n is the g.f. of A172392.