A265346 Inverse permutation to A265345.

1, 3, 2, 6, 7, 5, 4, 10, 11, 8, 46, 9, 22, 38, 56, 15, 79, 17, 29, 13, 16, 12, 191, 14, 37, 30, 92, 18, 379, 23, 172, 28, 407, 212, 667, 24, 232, 278, 67, 19, 1654, 155, 301, 69, 704, 47, 466, 20, 121, 353, 497, 39, 781, 107, 254, 25, 137, 57, 2081, 31, 277, 192, 106, 21, 1541, 68, 211, 58, 1082, 93, 1712, 32, 326, 255, 154, 48, 2702, 80, 352, 26, 821

Offset: 1

Author

Antti Karttunen, Dec 18 2015

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10328
• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Inverse: A265345.

Cf. A265331, A265911.

Programs

Scheme

(define (A265346 n) (let ((col (A265911 n)) (row (A265331 n))) (* (/ 1 2) (- (expt (+ row col) 2) row col col col -2))))

Formula

a(n) = (1/2) * ((c+r)^2 - r - 3*c + 2), where c = A265911(n), and r = A265331(n).