Number of nondecreasing sequences that are differences of two permutations of 1,2,...,n.
A019589
Number of nondecreasing sequences that are differences of two permutations of 1,2,...,n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =59a(6) =246a(7) =1105a(8) =5270a(9) =26231a(10) =135036a(11) =713898a(12) =3857113a(13) =21220020a(14) =118547774a(15) =671074583a(16) =3842667769a(17) =22226558786a(18) =129714293092
External references
- oeis: A019589