Number of arrays of 5 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.

A201813

Number of arrays of 5 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.

Terms

    a(0) =51a(1) =221a(2) =631a(3) =1401a(4) =2651a(5) =4501a(6) =7071a(7) =10481a(8) =14851a(9) =20301a(10) =26951a(11) =34921a(12) =44331a(13) =55301a(14) =67951a(15) =82401a(16) =98771a(17) =117181a(18) =137751a(19) =160601a(20) =185851a(21) =213621a(22) =244031a(23) =277201a(24) =313251a(25) =352301a(26) =394471a(27) =439881a(28) =488651a(29) =540901

External references