Number of zero-sum -4..4 arrays of n elements with first through fourth differences also in -4..4.

A201435

Number of zero-sum -4..4 arrays of n elements with first through fourth differences also in -4..4.

Terms

    a(0) =1a(1) =5a(2) =21a(3) =75a(4) =111a(5) =527a(6) =1275a(7) =3643a(8) =10245a(9) =30215a(10) =82859a(11) =239133a(12) =688547a(13) =1986411a(14) =5743067a(15) =16751055a(16) =48750751a(17) =142319063a(18) =416145857a(19) =1218638091a(20) =3571823395a(21) =10485601869a(22) =30812312143a(23) =90634015523a(24) =266849118935a(25) =786358091871

External references