A105542 Matrix square of triangle A105540 and, in this flattened form as read by rows, also equals column 1 of A105540.

1, 2, 1, 4, 4, 1, 6, 8, 6, 1, 13, 14, 14, 8, 1, 26, 47, 26, 22, 10, 1, 33, 58, 115, 42, 32, 12, 1, 75, 133, 102, 229, 62, 44, 14, 1, 101, 292, 393, 158, 401, 86, 58, 16, 1, 172, 285, 791, 921, 226, 643, 114, 74, 18, 1, 356, 950, 631, 1758, 1849, 306, 967, 146, 92, 20, 1, 633

Offset

0,2

Comments

Column n of triangular matrix A105540 equals A105540^(n+1) when flattened as read by rows.

Links

Table of n, a(n) for n=0..66.

Example

Triangle begins:
1;
2,1;
4,4,1;
6,8,6,1;
13,14,14,8,1;
26,47,26,22,10,1;
33,58,115,42,32,12,1;
75,133,102,229,62,44,14,1;
101,292,393,158,401,86,58,16,1;
172,285,791,921,226,643,114,74,18,1; ...

Crossrefs

Cf. A105540, A105543 (column 0), A105544 (row sums).

Sequence in context: A214985 A105537 A115237 * A208907 A200057 A136600

Adjacent sequences: A105539 A105540 A105541 * A105543 A105544 A105545

Keyword

nonn,tabl

Author

Paul D. Hanna, Apr 13 2005

Status

approved