A348151 First differences of A006905.

1, 11, 158, 3823, 150309, 9260886, 868807341, 121329481093, 24768540218324, 7282559551588341, 3046214096033592769, 1793950037677437221180, 1474265690307795355749075, 1677763495455703210030729685, 2626545934585707736394538773674, 5623547642339635201400382321016283

Offset

1,2

Comments

Number of transitive relations involving a particular element of an n-set.

Links

Table of n, a(n) for n=1..16.

Firdous Ahmad Mala, Some New Integer Sequences of Transitive Relations, J. Appl. Math. Comp. (2023) Vol. 7, No. 1, 108-111.

Formula

a(n) = A006905(n) - A006905(n-1).

Example

a(3) = A006905(3) - A006905(2) = 171 - 13 = 158.

Crossrefs

Cf. A006905.

Sequence in context: A156933 A242008 A158512 * A324430 A326097 A135700

Adjacent sequences: A348148 A348149 A348150 * A348152 A348153 A348154

Keyword

nonn

Author

Firdous Ahmad Mala, Oct 03 2021

Status

approved