A128318 - cp's OEIS frontend

A128318 G.f.: A(x) = 1+x(1+2x(1+3x(...(1+nx*(...)^2)^2...)^2)^2)^2.

n	a(n)
0	1
1	1
2	4
3	28
4	276
5	3480
6	53232
7	955524
8	19672320
9	456803328
10	11810032896
11	336463895808
12	10473959755008
13	353739038360832
14	12883270796310528
15	503352328766459904
16	21001144899441162240
17	931963581151516477440
18	43832663421577452887040
19	2178029362561822117094400
20	114014865901176834809333760

[1, 1, 4, 28, 276, 3480, 53232, 955524, 19672320, 456803328, 11810032896, 336463895808, 10473959755008, 353739038360832, 12883270796310528, 503352328766459904, 21001144899441162240, 931963581151516477440, 43832663421577452887040, 2178029362561822117094400, 114014865901176834809333760]

cp's OEIS Frontend

A128318 G.f.: A(x) = 1+x(1+2x(1+3x(...(1+nx*(...)^2)^2...)^2)^2)^2.

Table of values

List of values

cp's OEIS Frontend

A128318 G.f.: A(x) = 1+x*(1+2x*(1+3x*(...(1+n*x*(...)^2)^2...)^2)^2)^2.

Table of values

List of values

A128318 G.f.: A(x) = 1+x(1+2x(1+3x(...(1+nx*(...)^2)^2...)^2)^2)^2.