A105537 Matrix square of triangle A105535 and, in this flattened form as read by rows, also equals diagonal 1 of A105535.

1, 2, 1, 4, 4, 1, 6, 8, 2, 1, 12, 26, 7, 12, 4, 21, 55, 15, 34, 12, 1, 32, 91, 25, 65, 22, 2, 1, 52, 178, 44, 237, 80, 10, 24, 9, 83, 329, 74, 593, 200, 27, 82, 32, 1, 127, 557, 117, 1178, 396, 55, 196, 76, 4, 1, 185, 866, 174, 1990, 670, 95, 361, 135, 8, 2, 1, 273, 1411, 261

Offset

0,2

Comments

Diagonal n of triangular matrix A105535 equals A105535^(n+1) when flattened as read by rows.

Links

Table of n, a(n) for n=0..68.

Example

Triangle begins:
1;
2,1;
4,4,1;
6,8,2,1;
12,26,7,12,4;
21,55,15,34,12,1;
32,91,25,65,22,2,1;
52,178,44,237,80,10,24,9;
83,329,74,593,200,27,82,32,1;
127,557,117,1178,396,55,196,76,4,1; ...

Prog

(PARI)

Crossrefs

Cf. A105535, A105538 (row sums).

Sequence in context: A009949 A070785 A214985 * A115237 A105542 A208907

Adjacent sequences: A105534 A105535 A105536 * A105538 A105539 A105540

Keyword

nonn,tabl

Author

Paul D. Hanna, Apr 12 2005

Status

approved