A318152 - cp's OEIS frontend

A318152 e-numbers of unlabeled rooted trees. A number n is in the sequence iff n = 2^(prime(y_1) * ... * prime(y_k)) for some k > 0 and y_1, ..., y_k already in the sequence.

n	a(n)
1	1
2	4
3	16
4	128
5	256
6	16384
7	65536
8	268435456
9	4294967296
10	562949953421312
11	9007199254740992
12	72057594037927936
13	18446744073709551616
14	316912650057057350374175801344
15	81129638414606681695789005144064
16	5192296858534827628530496329220096

[1, 4, 16, 128, 256, 16384, 65536, 268435456, 4294967296, 562949953421312, 9007199254740992, 72057594037927936, 18446744073709551616, 316912650057057350374175801344, 81129638414606681695789005144064, 5192296858534827628530496329220096]

cp's OEIS Frontend

A318152 e-numbers of unlabeled rooted trees. A number n is in the sequence iff n = 2^(prime(y_1) * ... * prime(y_k)) for some k > 0 and y_1, ..., y_k already in the sequence.

Table of values

List of values