21453

Appears in sequences

• Base-8 palindromes that start with 5.at n=33A043025
• Numbers with 5 distinct digits {1,2,3,4,5} such that all adjacent digits (as well as first and last digits) are coprime.at n=14A104972
• Expansion of 1/((1 +x +x^2)^2 *(1 +x^2 +x^3)^3).at n=32A167177
• Permutations of 12345: Numbers having each of the decimal digits 1,...,5 exactly once, and no other digit.at n=27A178475
• Number of length n arrays of permutations of 0..n-1 with each element moved by -2 to 2 places and every four consecutive elements having its maximum within 4 of its minimum.at n=22A263711
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 129", based on the 5-celled von Neumann neighborhood.at n=33A270219
• Number of length n inversion sequences avoiding the patterns 000, 010, 100, 110, 120, and 210.at n=11A279544
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p that are > p/2.at n=17A282725
• Decimal encoding T(n,k) of the k-th non-averaging permutation of [n]; triangle T(n,k), n >= 0, k = 1..A003407(n), read by rows.at n=20A292523
• Derangements of {1,2,...,n} (n >= 2) in lexicographic order.at n=12A320588