Zseq (version 0.1.1)

Telephone: Telephone numbers

Description

Under OEIS A000085, a Telephone number - also known as Involution number - is counting the number of connection patterns in a telephone system with n subscribers, or in a more mathematical term, the number of self-inverse permutations on n letters. First 6 Telephone numbers are 1, 1, 2, 4, 10, 26,

Usage

Telephone(n, Rmpfr = TRUE, PrecisionBits = 496)

Arguments

n

the number of first n entries from the sequence.

Rmpfr

a logical; TRUE to use large number representation, FALSE otherwise.

PrecisionBits

a positive integer for precision bits larger than 2.

Value

a vector of length n containing first entries from the sequence.

Examples

# NOT RUN {
## generate first 20 Regular numbers
first20 = Regular(20)

## print without trailing 0's.
print(first20, drop0trailing = TRUE)

# }