A257504 - OEIS

A257504

Inverse permutation to A257503.

1, 2, 4, 3, 7, 11, 16, 22, 29, 37, 46, 5, 56, 67, 79, 8, 92, 6, 106, 121, 137, 12, 154, 172, 191, 211, 232, 254, 277, 301, 326, 352, 379, 407, 436, 466, 497, 529, 562, 596, 631, 667, 704, 742, 781, 821, 862, 17, 904, 947, 991, 23, 1036, 1082, 1129, 1177, 1226, 1276, 1327, 30, 1379, 1432, 1486, 38, 1541, 47, 1597, 1654, 1712, 57, 1771, 9

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OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10440

Index entries for sequences related to factorial base representation

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = (1/2) * ((c+r)^2 - r - 3*c + 2), where c = A257681(n), and r = A257679(n).

PROG

(Scheme) (define (A257504 n) (let ((col (A257681 n)) (row (A257679 n))) (* (/ 1 2) (- (expt (+ row col) 2) row col col col -2))))

CROSSREFS