A159860 - cp's OEIS frontend

A159860 The maximum length of a string of identical characters which can be reduced to one character in "n" nested substitution operations, e.g. replace(string, substring, character) such that all shorter strings will also reduce to one character.

n	a(n)
1	2
2	4
3	10
4	40
5	460
6	53590
7	718052410
8	128899816953780640
9	4153790702679538920955222740373360
10	4313494300416744426870901874924164733839903365825579313972159982440

[2, 4, 10, 40, 460, 53590, 718052410, 128899816953780640, 4153790702679538920955222740373360, 4313494300416744426870901874924164733839903365825579313972159982440]

cp's OEIS Frontend

A159860 The maximum length of a string of identical characters which can be reduced to one character in "n" nested substitution operations, e.g. replace(string, substring, character) such that all shorter strings will also reduce to one character.

Table of values

List of values