0,13

Row products give A139550.

Row products of the triangle are:

1 = 1

1*1 = 1

1*1*1 = 1

1*1*1*1 = 1

1*1*2*1*1 = 2

1*1*2*1*1*1 = 2

1*1*2*3*1*1*1 = 6

1*1*2*3*1*1*1*1 = 6

1*1*1*3*4*1*1*1*1 = 12

(Excel cell formula) =if(and(row()-1>=(column()-1)*2; row()-1<A014963(k-1)*(column()-1)*2); column()-1; 1)

Cf. A139550, A139547, A003418.

Adjacent sequences: A139546 A139547 A139548 this_sequence A139550 A139551 A139552

Sequence in context: A136441 A030561 A074064 this_sequence A130782 A055457 A032542

nonn,tabl

Mats O. Granvik (mgranvik(AT)abo.fi), Apr 27 2008