A117268 Triangle, binomial transform of the tribonacci sequence.

1, 1, 1, 2, 1, 2, 4, 2, 3, 5, 7, 4, 6, 9, 14, 13, 7, 11, 17, 26, 40, 24, 13, 20, 31, 48, 74, 114, 44, 24, 37, 57, 88, 136, 210, 324, 81, 44, 68, 105, 162, 250, 386, 596, 920

Offset: 1

Author

Gary W. Adamson, Mar 05 2006

Keywords

• nonn
• tabl

Comments

Leftmost column of the triangle = the tribonacci sequence A000073.

Rightmost diagonal of the triangle = A117189.

Examples

			Taking difference rows of A117267: (1; 1, 2; 2, 3, 5; 4, 6, 9, 14;...), we get A117268:
1;
1, 1;
2, 1, 2;
4, 2, 3, 5;
7, 4, 6, 9, 14;
13, 7, 11, 17, 26, 40;
24, 13, 20, 31, 48, 74, 114;
...
		

Crossrefs

Cf. A117267, A117189 (row sums), A000073.

Formula

Difference rows of A117267 become rows of A117268