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A032093 Number of reversible strings with n-1 beads of 2 colors. 6 beads are black. Strings are not palindromic. 2
3, 12, 40, 100, 226, 452, 848, 1484, 2485, 3976, 6160, 9240, 13524, 19320, 27072, 37224, 50391, 67188, 88440, 114972, 147862, 188188, 237328, 296660, 367913, 452816, 553504, 672112, 811240, 973488, 1161984, 1379856 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,1

LINKS

Table of n, a(n) for n=8..39.

C. G. Bower, Transforms (2)

FORMULA

"BHK[ 7 ]" (reversible, identity, unlabeled, 7 parts) transform of 1, 1, 1, 1...

Empirical G.f.: -x^8*(x^2+3)/((x-1)^7*(x+1)^3). [Colin Barker, Nov 24 2012]

CROSSREFS

Cf. A282011.

Sequence in context: A062311 A237036 A034956 * A007993 A293366 A080929

Adjacent sequences:  A032090 A032091 A032092 * A032094 A032095 A032096

KEYWORD

nonn

AUTHOR

Christian G. Bower

EXTENSIONS

Definition changed slightly by Harvey P. Dale, Oct 02 2017

STATUS

approved

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Last modified February 19 06:46 EST 2018. Contains 299330 sequences. (Running on oeis4.)