81859

Appears in sequences

• Number of nonempty subsequences {s(k)} of 1..n such that the difference sequence is palindromic.at n=26A053599
• a(n) = 5*2^n - 4*n - 5.at n=13A126284
• a(n) = a(n-1) - a(n-2) + a(n-3) + a(n-4), with a(1) = a(2) = a(3) = a(4) = 1.at n=46A343885