A121399 - cp's OEIS frontend

A121399 G.f. satisfies: A(x) = G(x)A(x^2G(x)) where G(x) is the g.f. of the Motzkin numbers (A001006): G = (1 + xG + x^2G^2).

n	a(n)
0	1
1	1
2	3
3	6
4	17
5	42
6	114
7	302
8	827
9	2263
10	6275
11	17468
12	48967
13	137834
14	389738
15	1105861
16	3148240
17	8987989
18	25726635
19	73808069
20	212196040
21	611219900
22	1763659860
23	5097131364
24	14752847173
25	42757853357
26	124080269331
27	360493591232

[1, 1, 3, 6, 17, 42, 114, 302, 827, 2263, 6275, 17468, 48967, 137834, 389738, 1105861, 3148240, 8987989, 25726635, 73808069, 212196040, 611219900, 1763659860, 5097131364, 14752847173, 42757853357, 124080269331, 360493591232]

cp's OEIS Frontend

A121399 G.f. satisfies: A(x) = G(x)A(x^2G(x)) where G(x) is the g.f. of the Motzkin numbers (A001006): G = (1 + xG + x^2G^2).

Table of values

List of values

cp's OEIS Frontend

A121399 G.f. satisfies: A(x) = G(x)*A(x^2*G(x)) where G(x) is the g.f. of the Motzkin numbers (A001006): G = (1 + x*G + x^2*G^2).

Table of values

List of values

A121399 G.f. satisfies: A(x) = G(x)A(x^2G(x)) where G(x) is the g.f. of the Motzkin numbers (A001006): G = (1 + xG + x^2G^2).