A393080 Second column of A392806.

0, 0, 0, 0, 2, 4, 0, 4, 8, 0, 8, 16, 1, 11, 21, 2, 14, 26, 0, 16, 32, 7, 25, 43, 14, 34, 54, 0, 26, 52, 19, 47, 75, 38, 68, 98, 0, 34, 68, 25, 61, 97, 50, 88, 126, 0, 42, 84, 31, 75, 119, 62, 108, 154, 0, 52, 104, 43, 97, 151, 86, 142, 198, 4, 64, 124, 53, 115

Offset

0,5

Comments

See also A392806 for a Python program.

Links

A.H.M. Smeets, Table of n, a(n) for n = 0..10000

Formula

a(3^k) = 0, k >= 0.

a(3*n + k) = a(3*n) + 2*k*Sum_{i = 1..n} A051064(i), 0 < k < 3.

a(3^(e+1)*n + 3^e*k) = a(3^(e+1)*n) + k*max(0,-A392084(e)+2*3^e*Sum_{i=1..n} A051064(i), e >= 0, 0 < k < 3, a(0) = 0 (completely determines this sequence).

a(n) = A007949(A392805(n)).

Crossrefs

Cf. A007949, A051064, A392084, A392805, A392806.

Sequence in context: A327898 A140875 A364315 * A115368 A395805 A086932

Adjacent sequences: A393077 A393078 A393079 * A393081 A393082 A393083

Keyword

nonn

Author

A.H.M. Smeets, Feb 01 2026

Status

approved