Number of arrays of 2n nondecreasing integers in -4..4 with sum zero and equal numbers greater than zero and less than zero.

A203287

Number of arrays of 2n nondecreasing integers in -4..4 with sum zero and equal numbers greater than zero and less than zero.

Terms

    a(0) =5a(1) =21a(2) =69a(3) =188a(4) =444a(5) =944a(6) =1844a(7) =3369a(8) =5825a(9) =9621a(10) =15285a(11) =23492a(12) =35080a(13) =51084a(14) =72756a(15) =101601a(16) =139401a(17) =188257a(18) =250613a(19) =329304a(20) =427584a(21) =549176a(22) =698304a(23) =879749a(24) =1098881a(25) =1361721a(26) =1674977a(27) =2046108a(28) =2483364a(29) =2995856

External references