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

1, 2, 3, 5, 4, 6, 14, 10, 7, 8, 42, 28, 13, 9, 11, 132, 84, 37, 19, 12, 15, 429, 264, 112, 41, 24, 16, 17, 1430, 858, 354, 126, 56, 27, 18, 20, 4862, 2860, 1155, 402, 131, 70, 33, 21, 22, 16796, 9724, 3861, 1320, 422, 174, 79, 36, 23, 25, 58786, 33592, 13156, 4433

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..59.

Index entries for sequences that are permutations of the natural numbers

Example

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

Crossrefs

Variant: A085178.

Inverse permutation: A085181.

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

Sequence in context: A121664 A352943 A143514 * A360209 A114750 A234923

Adjacent sequences: A085177 A085178 A085179 * A085181 A085182 A085183

Keyword

nonn,tabl

Author

Antti Karttunen, Jun 18 2003

Status

approved