T(n,k) = number of nondecreasing arrangements of n numbers x(i) in -(n+k-2)..(n+k-2) with the sum of sign(x(i))*2^|x(i)| zero.
A187988
T(n,k) = number of nondecreasing arrangements of n numbers x(i) in -(n+k-2)..(n+k-2) with the sum of sign(x(i))*2^|x(i)| zero.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =0a(4) =2a(5) =3a(6) =0a(7) =3a(8) =5a(9) =9a(10) =0a(11) =4a(12) =7a(13) =15a(14) =36a(15) =0a(16) =5a(17) =9a(18) =22a(19) =57a(20) =117a(21) =0a(22) =6a(23) =11a(24) =30a(25) =82a(26) =181a(27) =411a(28) =0a(29) =7
External references
- oeis: A187988