A264932 a(1) = 1, a(2) = 3, a(n)= H_4(a(n-1),a(n-2)).

1, 3, 3, 7625597484987

Offset: 1

Author

Natan Arie Consigli, Dec 16 2015

Keywords

• nonn

Comments

See A054871 for definitions and key links.

Possible other sequence with the same 4 entries:

a(1)=1;

a(2)= 3;

a(n)=a(n-1)^a(n-2)^a(n-2);

Programs

Magma

I:=[1,3]; [n le 2 select I[n] else Self(n-1)^Self(n-2)^Self(n-2): n in [1..5]]; // Vincenzo Librandi, Dec 17 2015

Mathematica

RecurrenceTable[{a[1]==1, a[2]==3, a[n]==a[n-1]^a[n-2]^a[n-2]}, a, {n, 4}] (* Vincenzo Librandi, Dec 17 2015 *)