28495

Appears in sequences

• Number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 0, s(1) = 1, |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also sum of numbers in row n+1 of the array T in A026268.at n=10A026299
• Number of primitive (aperiodic) palindromic structures using exactly three different symbols.at n=20A056482
• Number of primitive (period n) periodic palindromic structures using exactly three different symbols.at n=20A056519
• Positions of non-crossing fixed-point-free involutions encoded by A014486 in A055089. Permutation of A064640.at n=13A064638
• Positions of non-crossing fixed-point-free involutions encoded by A014486 (after reflection) in A055089. Permutation of A064640.at n=19A064639
• Positions of non-crossing fixed-point-free involutions (encoded by A014486) in A055089, sorted to ascending order.at n=17A064640
• Numbers n such that sigma(n)=phi(n*bigomega(n)-1).at n=39A067877
• Column 3 of triangle A091602.at n=47A091606
• Position of the first subsequence of n primes that differs from the first n primes, but where the relative distances among their elements coincide with those of the subsequence of first n primes except for a scale factor.at n=4A359354