1,2

Also, a(n) = 1 + position of 0 in column n-1 of A308201.

Equals A307281 + 1. This is a self-inverse permutation of the positive integers.

Table of n, a(n) for n=1..67.

Cf. A274630, A308201, A307281.

Sequence in context: A071932 A246433 A324273 * A139348 A021683 A248179

Adjacent sequences: A308880 A308881 A308882 * A308884 A308885 A308886

nonn

N. J. A. Sloane, Jun 30 2019

approved