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Starting from zero, each term of the sequence is a(n) = a(n-1) - n but only if a(n) > 0 and it has not previously generated. In case the condition doesn't hold, a(n) = a(n-1) + n.

Print the first 250 terms of the sequence one per line.

0 characters
Top-level programs are supported, args holds ARGV.
ARGV is available via STDIN, joined on NULL. x is a no-op.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
say() is available without any import.
$args to access the arguments.
SELECT arg FROM argv to access the arguments, only the first column of the first result set will be printed, NULL values will be skipped, and the dialect is SQLite.
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