A166881 - cp's OEIS frontend

A166881 a(n) = coefficient of x^n in the (n-1)-th iteration of (x + x^2 + x^3) for n>=1.

n	a(n)
1	1
2	1
3	4
4	24
5	216
6	2540
7	36930
8	639093
9	12821788
10	292495896
11	7475306400
12	211531253076
13	6564750305124
14	221684308001728
15	8091749562745576
16	317454163281499140
17	13320693233434444092
18	595287890670560958740
19	28226111104873887744528
20	1415312988632326542765024

[1, 1, 4, 24, 216, 2540, 36930, 639093, 12821788, 292495896, 7475306400, 211531253076, 6564750305124, 221684308001728, 8091749562745576, 317454163281499140, 13320693233434444092, 595287890670560958740, 28226111104873887744528, 1415312988632326542765024]

cp's OEIS Frontend

A166881 a(n) = coefficient of x^n in the (n-1)-th iteration of (x + x^2 + x^3) for n>=1.

Table of values

List of values