[seqfan] A253072.

[Omar E. Pol]

Dear Neil,

An observation.
In the sequences A050476 and A253072 we have that: 

a(0) = 1
a(1) = 7
a(3) = 95
a(7) = 18447

A253072(2^k-1) = A050476(2^k-1), 0<=k<=m, where m is at least 3. 

Best regards. 

Omar E. Pol