A255558 Inverse permutation to A255557.

1, 2, 3, 5, 4, 7, 6, 9, 11, 8, 12, 16, 22, 29, 10, 14, 37, 17, 13, 46, 56, 18, 23, 67, 30, 38, 79, 92, 106, 121, 15, 20, 137, 47, 24, 154, 172, 19, 57, 191, 68, 25, 211, 232, 254, 31, 80, 277, 39, 48, 301, 326, 93, 107, 352, 122, 138, 379, 407, 436, 466, 497, 21, 27, 529, 155, 58, 562, 596, 32, 173, 631, 192, 26

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 r = A255559(n), and c = A255560(n).

Prog

(Scheme) (define (A255558 n) (let ((row (A255559 n)) (col (A255560 n))) (* (/ 1 2) (- (expt (+ row col) 2) row col col col -2))))

Crossrefs

Inverse permutation: A255557.

Cf. A255556, A255559, A255560.

Sequence in context: A246698 A246681 A123883 * A072062 A002192 A265888

Adjacent sequences: A255555 A255556 A255557 * A255559 A255560 A255561

Keyword

nonn

Author

Antti Karttunen, Apr 14 2015

Status

approved