21666

Appears in sequences

• Number of partitions with no even part repeated; partitions of n in which no parts are multiples of 4.at n=44A001935
• Number of "coherent" reduced decompositions for the longest permutation n n-1 n-2 ... 3 2 1 in the symmetric group on n letters.at n=5A014982
• 53 'Reverse and Add' steps are needed to reach a palindrome.at n=9A065320
• Numbers k such that k+1 is composite and divides 3^k-2^k.at n=37A068410
• Number of partitions of 2n in which no parts are multiples of 4.at n=22A081055
• Expansion of psi(x) / phi(x) in powers of x where phi(), psi() are Ramanujan theta functions.at n=44A083365
• Expansion of g.f. x*(1-x+x^5+x^6-x^7+x^9)/(1-2*x+x^4+x^6-2*x^7+x^10).at n=17A097596
• Number of (n+1)X5 0..1 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock differing from the number in all its horizontal and vertical neighbors.at n=13A205068
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 147", based on the 5-celled von Neumann neighborhood.at n=31A270292
• G.f. satisfies A(x) = 1 / (1 - x^2*A(x)^2 / (1 - x)).at n=13A376489