login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A280531 a(n) = A049501(A000142(n)). 2
0, 0, 1, 2, 2, 4, 11, 16, 16, 25, 30, 64, 39, 83, 111, 139, 139, 165, 205, 242, 283, 320, 336, 474, 440, 395, 637, 655, 886, 842, 1019, 1159, 1159, 1153, 1327, 1366, 1328, 1243, 1487, 1756, 1623, 2362, 2394, 2274, 2487, 2642, 2907, 2843, 3211, 3049, 3736 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

a(n) is the major index (1st definition) of n!.

LINKS

Indranil Ghosh, Table of n, a(n) for n = 0..10000

EXAMPLE

For n=4, A000142(n) = 24 and A049501(24) = 2. So a(n) = 2.

PROG

(Python)

import math

def M(n):

    x=bin(int(n))[2:]

    s=0

    for i in range(1, len(x)):

        if x[i-1]=="1" and x[i]=="0":

            s+=i

    return s

a=lambda n: M(math.factorial(n))

CROSSREFS

Cf. A000142, A049501.

Cf. A280062 (Major index (2nd definition) of n!).

Sequence in context: A220786 A280673 A067920 * A072074 A052338 A153950

Adjacent sequences:  A280528 A280529 A280530 * A280532 A280533 A280534

KEYWORD

nonn

AUTHOR

Indranil Ghosh, Jan 04 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 14 08:20 EDT 2020. Contains 336480 sequences. (Running on oeis4.)