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A288690 Number of n-digit biquanimous strings using digits {0,1,...,6}. 2
1, 1, 7, 64, 633, 5801, 48245, 372345, 2743793, 19706380, 139666975, 983424751, 6902981425, 48383824035, 338898209049, 2373012819041, 16613639684833, 116304663546706, 814166474511867, 5699292259116239, 39895529322328145, 279270568611716769, 1954901225698086549 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

A biquanimous string is a string whose digits can be split into two groups with equal sums.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (35, -557, 5373, -35284, 167758, -599018, 1643178, -3510009, 5878447, -7726457, 7932089, -6287970, 3771376, -1654048, 500240, -93216, 8064).

FORMULA

G.f.: -(4032*x^20 -50640*x^19 +300760*x^18 -1131816*x^17 +2828844*x^16 -5169218*x^15 +7372355*x^14 -8685305*x^13 +8984178*x^12 -8471674*x^11 +7172188*x^10 -5192457*x^9 +3073627*x^8 -1446472*x^7 +532167*x^6 -150791*x^5 +32203*x^4 -4997*x^3 +529*x^2 -34*x +1) / ((7*x-1) *(4*x-1) *(3*x-1)^2 *(2*x-1)^5 *(x-1)^8).

CROSSREFS

Column k=6 of A288638.

Sequence in context: A098307 A055995 A301424 * A213515 A293470 A256506

Adjacent sequences:  A288687 A288688 A288689 * A288691 A288692 A288693

KEYWORD

nonn,easy

AUTHOR

Alois P. Heinz, Jun 13 2017

STATUS

approved

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Last modified January 20 16:20 EST 2019. Contains 319335 sequences. (Running on oeis4.)