A145428 - OEIS

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A145428

Decimal expansion of Sum_{n>=1} 3^n*(n!)^2/(2n)!.

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

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OFFSET

2,3

REFERENCES

Alexander Apelblat, Tables of Integrals and Series, Harri Deutsch, 1996, 4.1.34.

LINKS

Table of n, a(n) for n=2..94.

FORMULA

Equals 3 + 10 * A019694 * A020760.

EXAMPLE

10.255197456936871...

MAPLE