0,12

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

Table of n, a(n) for n=0..67.

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 is an integer.

Cf. A051907, A051908, A058360, A339627, A339629.

Sequence in context: A013266 A154420 A255305 * A304271 A293590 A194770

Adjacent sequences: A339625 A339626 A339627 * A339629 A339630 A339631

nonn

Ilya Gutkovskiy, Dec 10 2020

approved