Number of strings of numbers x(i=1..n) in 0..5 with sum i*x(i) equal to n*5.

Terms

a(0) =1a(1) =3a(2) =12a(3) =46a(4) =156a(5) =476a(6) =1349a(7) =3571a(8) =8939a(9) =21310a(10) =48701a(11) =107233a(12) =228465a(13) =472626a(14) =952169a(15) =1872813a(16) =3604103a(17) =6798753a(18) =12592030a(19) =22930495a(20) =41108069a(21) =72630552a(22) =126596216a(23) =217879554a(24) =370555433a(25) =623223294a(26) =1037221437a(27) =1709205913