A254106 Inverse permutation to A254105.

1, 2, 3, 6, 4, 5, 10, 15, 9, 21, 28, 7, 8, 14, 36, 45, 20, 55, 66, 13, 27, 78, 91, 35, 105, 120, 11, 12, 19, 44, 136, 153, 54, 171, 190, 26, 65, 210, 231, 77, 253, 276, 18, 34, 90, 300, 325, 104, 351, 378, 43, 119, 406, 435, 135, 465, 496, 16, 17, 25, 53, 152, 528, 561, 170, 595, 630, 64, 189, 666, 703, 209, 741, 780, 33, 76

Offset: 1

Author

Antti Karttunen, Jan 27 2015

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..8192
• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Inverse: A254105.

Cf. A254108, A254111, A254112.

Programs

Scheme

(define (A254106 n) (let ((col (A254112 n)) (row (A254111 n))) (* (/ 1 2) (- (expt (+ col row) 2) col row row row -2))))