1,2

A permutation of the natural numbers.

C. Kimberling, "Fractal sequences and interspersions," Ars Combinatoria 45 (1997) 157-168.

Table of n, a(n) for n=1..45.

Rectangular array T given by antidiagonals. T(i,j) = the j-th index n such that A131967(n)=i.

Northwest corner:

1 3 6 11 18

2 5 10 17 28

4 8 14 23 35

7 13 21 33 48

Cf. A131967.

Sequence in context: A145522 A283939 A293056 * A191740 A132665 A255122

Adjacent sequences: A131965 A131966 A131967 * A131969 A131970 A131971

nonn,tabl

Clark Kimberling, Aug 02 2007

approved