87700domain: NAppears in sequencesBinomial transform of [1, 7, 17, 17, 6, 0, 0, 0, ...].at n=23A132117a(n) is the number of fixed polyominoes with sprawl n.at n=28A338212Number of integer partitions of n > 0 that are not the first sums of any composition with all parts > 1.at n=44A391620