A381610 - OEIS

%I #10 Mar 03 2025 09:33:16

%S 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,27,24,

%T 28,25,29,26,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,

%U 49,50,54,51,55,52,56,53,57,58,59,60,61,62,63,64,65,66,67

%N Irregular table T(n, k), n >= 0, k = 1..A381609(n), read by rows: the n-th row lists the numbers m such that A381607(m) = n.

%C As a flat sequence, this is a permutation of the nonnegative integers with inverse A381611.

%H Rémy Sigrist, <a href="/A381610/b381610.txt">Table of n, a(n) for n = 0..4693</a> (rows for n = 0..3^7 flattened)

%H Rémy Sigrist, <a href="/A381610/a381610_1.gp.txt">PARI program</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%e Table T(n, k) begins:

%e   n   n-th row

%e   --  --------

%e    0  0

%e    1  1

%e    2  2

%e    3  3

%e    4  4

%e    5  5

%e    6  6

%e    7  7

%e    8  8, 9

%e    9  10

%e   10  11

%e   11  12

%e   12  13

%e   13  14

%e   14  15

%e   15  16

%e   16  17, 18

%e   17  19

%e   18  20

%e   19  21

%e   20  22

%o (PARI) \\ See Links section.

%Y Cf. A381607, A381609, A381611 (inverse).

%K nonn,base,tabf

%O 0,3

%A _Rémy Sigrist_, Mar 01 2025