1,2

A permutation of the natural numbers. Row 1 consists of those congruent to 1 mod 3. (One can then delete row 1 of A114883, leaving only numbers congruent to 0 or 2 mod 3 and then replace each by its rank, thus obtaining another permutation of the natural numbers.)

Also numbers from the array A083140, without the first row, minus 1 divided by 2.

Start with the northwest corner of A114881:

1 3 5 7 9

2 8 14 20 26

4 24 34 54 64

6 48 76 90 118

Delete row 1, leaving all the even positive integers; divide them by 2:

1 4 7 10 13

2 12 17 27 32

3 24 38 45 59

Cf. A083140, A114881.

Sequence in context: A143986 A059662 A259630 * A125091 A209048 A181327

Adjacent sequences: A114880 A114881 A114882 * A114884 A114885 A114886

nonn,tabl

Clark Kimberling, Jan 03 2006

approved