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A163331 Inverse permutation of A163330. 4
0, 2, 5, 1, 4, 8, 3, 7, 12, 9, 14, 20, 13, 19, 26, 18, 25, 33, 27, 35, 44, 34, 43, 53, 42, 52, 63, 6, 11, 17, 10, 16, 23, 15, 22, 30, 24, 32, 41, 31, 40, 50, 39, 49, 60, 51, 62, 74, 61, 73, 86, 72, 85, 99, 21, 29, 38, 28, 37, 47, 36, 46, 57, 48, 59, 71, 58, 70, 83, 69, 82, 96 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

A. Karttunen, Table of n, a(n) for n = 0..6560

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = A001477bi(A163326(n),A163325(n)), where A001477bi(x,y) = (((x+y)^2)+x+(3y))/2.

PROG

(Scheme:) (define (A163331 n) (A001477bi (A163326 n) (A163325 n)))

(define (A001477bi x y) (/ (+ (expt (+ x y) 2) x (* 3 y)) 2))

CROSSREFS

Inverse: A163330. a(n) = A163329(A163327(n)). Cf. A007089.

Sequence in context: A274880 A034005 A161688 * A011034 A191332 A229982

Adjacent sequences:  A163328 A163329 A163330 * A163332 A163333 A163334

KEYWORD

nonn,base

AUTHOR

Antti Karttunen, Jul 29 2009

STATUS

approved

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Last modified July 18 07:05 EDT 2019. Contains 325134 sequences. (Running on oeis4.)