COMMENTS

The linked xkcd webcomic number 2016 (subtitled "OEIS keeps rejecting my submissions") shows as its second example "SUB[44]: Integers in increasing order of width when printed in Helvetica". To make a sequence involving a font well-defined, the definition can be interpreted using information provided in the corresponding Adobe Font Metrics File. However since Helvetica is a proprietary font, the almost-identical font metrics of the Arial regular font are used here instead. Also, the vague description "width when printed" is interpreted as the size of the bounding box in the printing direction. This takes into account the actual left and right margin of the characters, which is smaller than the fixed width of 556/1000 size units for all digits, as well as the effect of the special kerning data for the character pair "11" (which is printed closer together by -74/1000 size units than other digit pairs). The sequence is a permutation of the nonnegative integers.