4,2

Earl Glen Whitehead, Jr., Four-discordant permutations, J. Austral. Math. Soc. Ser. A 28 (1979), no. 3, 369-377.

Adjacent sequences: A004306 A004307 A004308 this_sequence A004310 A004311 A004312

Sequence in context: A083585 A002493 A054364 this_sequence A052664 A090373 A041184

nonn

njas