2099196

Appears in sequences

• Number of primitive (aperiodic) reversible strings with n beads using a maximum of four different colors.at n=10A056315
• Least k such that k-1 and k+1 in binary representation have same number n of 0's as 1's.at n=9A191296
• Number of n-tuples of 4 elements excluding reverse duplicates and those consisting of repetitions of the same element only.at n=11A321579