0,12

Also the number of ordered ways to express 1 as the sum of distinct unit fractions such that the sum of the denominators is n.

Table of n, a(n) for n=0..75.

Index entries for sequences related to compositions

Index entries for sequences related to Egyptian fractions

a(11) = 6 because we have 2 + 3 + 6 = 2 + 6 + 3 = 3 + 2 + 6 = 3 + 6 + 2 = 6 + 2 + 3 = 6 + 3 + 2 = 11 and 1/2 + 1/3 + 1/6 = 1.

Cf. A051907, A051908, A058360, A339627, A339628.

Sequence in context: A186685 A341882 A307382 * A331428 A323487 A173453

Adjacent sequences: A339626 A339627 A339628 * A339630 A339631 A339632

nonn

Ilya Gutkovskiy, Dec 10 2020

approved