27818

Appears in sequences

• Number of 5-step E, S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=13A187588
• Expansion of Product_{k>=1} 1/(1 - x^(k*(k+1)/2))^(k*(k+1)/2).at n=31A298730
• Number of nX5 0..1 arrays with every element unequal to 0, 1, 3 or 5 king-move adjacent elements, with upper left element zero.at n=9A303966
• a(1) = 1; a(n) = 1 + a(n-1) + Sum_{k=2..n} a(floor(n/k)).at n=43A351621
• Square array A(n, k) = A388283(A246278(n, k)), read by falling antidiagonals. Numerator of (3*n-sigma(n))/n, as applied to the prime shift array.at n=70A388284