Number of permutations p of [n] such that 0p has a nonincreasing jump sequence.

A291685

Number of permutations p of [n] such that 0p has a nonincreasing jump sequence.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =52a(6) =189a(7) =683a(8) =2621a(9) =10061a(10) =40031a(11) =159201a(12) =650880a(13) =2657089a(14) =11062682a(15) =46065143a(16) =194595138a(17) =822215099a(18) =3513875245a(19) =15021070567a(20) =64785349064a(21) =279575206629

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