This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A381610 #10 Mar 03 2025 09:33:16 %S A381610 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 A381610 28,25,29,26,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48, %U A381610 49,50,54,51,55,52,56,53,57,58,59,60,61,62,63,64,65,66,67 %N A381610 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 A381610 As a flat sequence, this is a permutation of the nonnegative integers with inverse A381611. %H A381610 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 A381610 Rémy Sigrist, <a href="/A381610/a381610_1.gp.txt">PARI program</a> %H A381610 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A381610 Table T(n, k) begins: %e A381610 n n-th row %e A381610 -- -------- %e A381610 0 0 %e A381610 1 1 %e A381610 2 2 %e A381610 3 3 %e A381610 4 4 %e A381610 5 5 %e A381610 6 6 %e A381610 7 7 %e A381610 8 8, 9 %e A381610 9 10 %e A381610 10 11 %e A381610 11 12 %e A381610 12 13 %e A381610 13 14 %e A381610 14 15 %e A381610 15 16 %e A381610 16 17, 18 %e A381610 17 19 %e A381610 18 20 %e A381610 19 21 %e A381610 20 22 %o A381610 (PARI) \\ See Links section. %Y A381610 Cf. A381607, A381609, A381611 (inverse). %K A381610 nonn,base,tabf %O A381610 0,3 %A A381610 _Rémy Sigrist_, Mar 01 2025