A137593 - OEIS

%I #11 Apr 02 2022 09:25:46

%S 1,1,2,1,4,4,1,4,16,12,1,4,16,84,48,1,4,16,156,504,192,1,4,16,156,

%T 1464,3312,960,1,4,16,156,1464,14112,24720,5760,1,4,16,156,1464,24912,

%U 158640,189360,34560,1,4,16,156,1464,24912,400560,1761840,1607040,241920

%N Triangle read by rows: matrix product A000012 * A136717.

%C Right border = A004527: (1, 2, 4, 12, 48, 192, ...).

%C Row sums = A007489 starting (1, 3, 9, 33, 153, ...).

%F A000012 * A136717 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e   1;

%e   1, 2;

%e   1, 4,  4;

%e   1, 4, 16,  12;

%e   1, 4, 16,  84,   48;

%e   1, 4, 16, 156,  504,  192;

%e   1, 4, 16, 156, 1464, 3312, 960;

%e   ...

%Y Cf. A136717, A004527, A007489.

%K nonn,tabl

%O 1,3

%A _Gary W. Adamson_, Jan 28 2008

%E Typo in eighth row corrected by _Olivier Gérard_, Oct 30 2012