A384215 - OEIS

A384215

Decimal expansion of the surface area of a gyroelongated square cupola with unit edge.

1, 8, 4, 8, 8, 6, 8, 1, 1, 6, 2, 5, 9, 0, 5, 7, 6, 5, 6, 5, 2, 4, 0, 6, 0, 9, 1, 5, 5, 9, 4, 8, 7, 5, 7, 9, 9, 1, 8, 5, 3, 3, 7, 0, 0, 1, 9, 8, 0, 5, 7, 9, 9, 2, 8, 6, 6, 3, 2, 3, 9, 4, 3, 7, 3, 2, 4, 1, 1, 3, 0, 0, 4, 1, 4, 6, 8, 2, 1, 4, 2, 6, 3, 1, 0, 6, 5, 0, 6, 0

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OFFSET

2,2

COMMENTS

The gyroelongated square cupola is Johnson solid J_23.

LINKS

Paolo Xausa, Table of n, a(n) for n = 2..10000

Wikipedia, Gyroelongated square cupola.

FORMULA

Equals 7 + 2*sqrt(2) + 5*sqrt(3) = 7 + A010466 + 5*A002194.

Equals the largest root of x^4 - 28*x^3 + 128*x^2 + 952*x - 1244.

EXAMPLE