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A085180 Array A(x,y) giving the position of the y-th x in A007001 listed by rising antidiagonals. 4

%I #19 Jan 16 2024 08:34:28

%S 1,2,3,5,4,6,14,10,7,8,42,28,13,9,11,132,84,37,19,12,15,429,264,112,

%T 41,24,16,17,1430,858,354,126,56,27,18,20,4862,2860,1155,402,131,70,

%U 33,21,22,16796,9724,3861,1320,422,174,79,36,23,25,58786,33592,13156,4433

%N Array A(x,y) giving the position of the y-th x in A007001 listed by rising antidiagonals.

%C Read by upwards antidiagonals as A(1,1), A(2,1), A(1,2), A(3,1), A(2,2), A(1,3), etc.

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

%e In A007001 each n occurs for the first time at position Cat(n), thus A(x,1) (the first row) is A000108.

%Y Variant: A085178.

%Y Inverse permutation: A085181.

%Y First row: A000108, second row: A068875 apart from initial terms, first column: A085197, central diagonal: A001453.

%K nonn,tabl

%O 1,2

%A _Antti Karttunen_, Jun 18 2003

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)