A207829 First line of square array such that T[n+1,k] = | T[n,k] +/- T[n,k+1] |, filling antidiagonals with the smallest possible positive integers not occurring earlier.

1, 2, 4, 7, 8, 10, 13, 12, 16, 20, 19, 32, 24, 34, 29, 40, 31, 45, 52, 42, 62, 81, 46, 47, 83, 55, 70, 91, 67, 78, 98, 61, 80, 106, 105, 84, 99, 120, 131, 142, 149, 164, 113, 118, 171, 111, 135, 134, 177, 180

Offset

1,2

Comments

First 50 terms computed by A. Groeneveld.

Links

Table of n, a(n) for n=1..50.

E. Angelini, Tableau avec soustractions/additions, Feb 19 2012

E. Angelini, Tableau avec soustractions/additions [Cached copy, with permission]

Crossrefs

The full table is given in A207831.

A variant of this sequence is given in A207827.

Sequence in context: A341350 A047540 A116478 * A207827 A047236 A371638

Adjacent sequences: A207826 A207827 A207828 * A207830 A207831 A207832

Keyword

nonn

Author

Eric Angelini, Feb 20 2012

Status

approved