A107722 Matrix square of triangle A107721, read by rows.

1, 2, 1, 12, 4, 1, 114, 32, 6, 1, 1446, 364, 62, 8, 1, 22722, 5276, 854, 102, 10, 1, 424302, 92332, 14466, 1664, 152, 12, 1, 9168162, 1889012, 289222, 32536, 2874, 212, 14, 1, 224961774, 44207212, 6652522, 737472, 63886, 4564, 282, 16, 1, 6180211842

Offset

0,2

Comments

Matrix (2/3)-power of triangle A107717. SHIFT_LEFT of column 0 = 2*(column 1 of A107717). Matrix inverse is A107728.

Links

Table of n, a(n) for n=0..45.

Example

Triangle begins:
1;
2,1;
12,4,1;
114,32,6,1;
1446,364,62,8,1;
22722,5276,854,102,10,1;
424302,92332,14466,1664,152,12,1;
9168162,1889012,289222,32536,2874,212,14,1; ...

Prog

(PARI)

Crossrefs

Cf. A107717, A107721, A107728.

Sequence in context: A287716 A286640 A288359 * A357013 A370552 A167128

Adjacent sequences: A107719 A107720 A107721 * A107723 A107724 A107725

Keyword

nonn,tabl

Author

Paul D. Hanna, May 30 2005

Status

approved