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

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A285042 Number of primitive (period n) periodic palindromic structures of length n using an infinite alphabet. 4
 1, 1, 1, 1, 3, 4, 10, 14, 36, 50, 138, 202, 562, 876, 2589, 4134, 12828, 21146, 69115, 115974, 398619, 678554, 2450202, 4213596, 15939338, 27644432, 109304036, 190899270, 787013630, 1382958544, 5931819804, 10480142146, 46673246440, 82864869600, 382473261356 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS See A285037 for additional information. Permuting the symbols will not change the structure. LINKS Andrew Howroyd, Table of n, a(n) for n = 0..500 FORMULA a(n) = Sum_{d | n} mu(n/d) * A285013(d) for n > 0. PROG (PARI) \\ Requires T from A285037. seq(n)={my(A=T(n)); concat([1], vector(n, i, vecsum(A[i, ])))} \\ Andrew Howroyd, Oct 02 2019 CROSSREFS Row sums of A285037. Cf. A285013. Sequence in context: A056515 A056516 A056517 * A319719 A048155 A242342 Adjacent sequences:  A285039 A285040 A285041 * A285043 A285044 A285045 KEYWORD nonn AUTHOR Andrew Howroyd, Apr 08 2017 EXTENSIONS a(0)=1 prepended and terms a(28) and beyond from Andrew Howroyd, Oct 02 2019 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.

Last modified January 20 08:18 EST 2020. Contains 331081 sequences. (Running on oeis4.)