Number of strictly increasing arrangements of n nonzero numbers in -(n-1)..(n-1) with sum zero.

A188114

Number of strictly increasing arrangements of n nonzero numbers in -(n-1)..(n-1) with sum zero.

Terms

    a(0) =0a(1) =1a(2) =0a(3) =3a(4) =4a(5) =16a(6) =42a(7) =137a(8) =426a(9) =1398a(10) =4622a(11) =15594a(12) =53252a(13) =184060a(14) =642392a(15) =2261829a(16) =8024726a(17) =28664946a(18) =103015222a(19) =372234190a(20) =1351655526a(21) =4930080182a(22) =18055480464a(23) =66371559466a(24) =244817099870a(25) =905883648170

External references