A246276 Inverse of A246275 considered as a permutation of natural numbers.

1, 3, 2, 6, 4, 10, 7, 5, 11, 15, 16, 21, 22, 8, 29, 28, 37, 36, 46, 17, 56, 45, 67, 9, 79, 12, 92, 55, 106, 66, 121, 30, 137, 13, 154, 78, 172, 68, 191, 91, 211, 105, 232, 23, 254, 120, 277, 14, 301, 93, 326, 136, 352, 24, 379, 155, 407, 153, 436, 171, 466, 57, 497, 39, 529, 190, 562, 192, 596, 210, 631, 231, 667, 47, 704, 19

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..10001

Index entries for sequences that are permutations of the natural numbers

Formula

a(n) = 1 + ((((x+y)^2) - x - 3*y)/2), where x = A055396(n+1) and y = A246277(n+1).

Prog

(Scheme) (define (A246276 n) (let ((x (A055396 (+ 1 n))) (y (A246277 (+ 1 n)))) (* (/ 1 2) (- (expt (+ x y) 2) x y y y -2))))

Crossrefs

Inverse: A246275.

Cf. A055396, A246277, A246274, A246675.

Sequence in context: A094077 A260220 A249742 * A091018 A248971 A329435

Adjacent sequences: A246273 A246274 A246275 * A246277 A246278 A246279

Keyword

nonn

Author

Antti Karttunen, Aug 21 2014

Status

approved