A267102 Inverse permutation to A265901.

1, 2, 3, 4, 6, 10, 5, 7, 15, 21, 28, 9, 36, 14, 8, 11, 45, 55, 66, 78, 20, 91, 105, 27, 120, 35, 13, 136, 44, 19, 12, 16, 153, 171, 190, 210, 231, 54, 253, 276, 300, 65, 325, 351, 77, 378, 90, 26, 406, 435, 104, 465, 119, 34, 496, 135, 43, 18, 528, 152, 53, 25, 17, 22, 561, 595, 630, 666, 703, 741, 170, 780, 820

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers

Formula

a(n) = (1/2) * ((c+r)^2 - r - 3*c + 2), where c = A265332(n), and r = A162598(n).

Prog

(Scheme) (define (A267102 n) (let ((col (A265332 n)) (row (A162598 n))) (* (/ 1 2) (- (expt (+ row col) 2) row col col col -2))))

Crossrefs

Inverse: A265901.

Cf. A162598, A265332.

Sequence in context: A108858 A294688 A094859 * A122397 A359679 A339670

Adjacent sequences: A267099 A267100 A267101 * A267103 A267104 A267105

Keyword

nonn

Author

Antti Karttunen, Jan 10 2016

Status

approved