1,2

A079174(n)+A079175(n)=A079171(n)

Elements per row: 1,2,4,8,16,30,60,96 (A027423, number of positive divisors of n!)

First four rows: 0; 2,3; 1,12,71,3222; 0,1,14,23,270,495,48748,178932213

The sum of each row n is given by A079173(n).

C. van den Bosch, Closed binary operations on small sets

Index entries for sequences related to groupoids

Cf. A079172, A079173, A079175.

Sequence in context: A129969 A104379 A107415 this_sequence A102583 A030780 A137738

Adjacent sequences: A079171 A079172 A079173 this_sequence A079175 A079176 A079177

nonn,tabf

Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003