A218299 - cp's OEIS frontend

A218299 G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..2n} A084606(n,k)^2 x^k * A(x)^k ), where A084606(n,k) = [x^k] (1 + 2x + 2x^2)^n.

n	a(n)
0	1
1	1
2	5
3	21
4	109
5	573
6	3209
7	18425
8	108649
9	652425
10	3979805
11	24583853
12	153488501
13	966993893
14	6139832385
15	39249227569
16	252400089361
17	1631676380497
18	10597809743477
19	69123464993925
20	452567027633853
21	2973269053045197
22	19595030047168569
23	129509530910221737

[1, 1, 5, 21, 109, 573, 3209, 18425, 108649, 652425, 3979805, 24583853, 153488501, 966993893, 6139832385, 39249227569, 252400089361, 1631676380497, 10597809743477, 69123464993925, 452567027633853, 2973269053045197, 19595030047168569, 129509530910221737]

cp's OEIS Frontend

A218299 G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..2n} A084606(n,k)^2 x^k * A(x)^k ), where A084606(n,k) = [x^k] (1 + 2x + 2x^2)^n.

Table of values

List of values

cp's OEIS Frontend

A218299 G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..2*n} A084606(n,k)^2 * x^k * A(x)^k ), where A084606(n,k) = [x^k] (1 + 2*x + 2*x^2)^n.

Table of values

List of values

A218299 G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..2n} A084606(n,k)^2 x^k * A(x)^k ), where A084606(n,k) = [x^k] (1 + 2x + 2x^2)^n.