Number of nondecreasing arrangements of n numbers x(i) in -(n+3)..(n+3) with the sum of sign(x(i))*2^|x(i)| zero.
A187984
Number of nondecreasing arrangements of n numbers x(i) in -(n+3)..(n+3) with the sum of sign(x(i))*2^|x(i)| zero.
Terms
- a(0) =0a(1) =5a(2) =11a(3) =39a(4) =144a(5) =467a(6) =1673a(7) =5825a(8) =20404a(9) =72246a(10) =255137a(11) =905611a(12) =3220635a(13) =11472797a(14) =40956011a(15) =146412581a(16) =524169045a(17) =1878990744a(18) =6743276222a(19) =24225861208a(20) =87117117408a(21) =313552816720
External references
- oeis: A187984