Number of nondecreasing arrays of n 0..n-1 integers with the sum of their 2nd powers equal to sum(i^2,i=0..n-1).
A216630
Number of nondecreasing arrays of n 0..n-1 integers with the sum of their 2nd powers equal to sum(i^2,i=0..n-1).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =14a(7) =37a(8) =105a(9) =309a(10) =939a(11) =2903a(12) =8865a(13) =28163a(14) =90648a(15) =297615a(16) =989077a(17) =3320885a(18) =11280835a(19) =38583017a(20) =133018026a(21) =461630411a(22) =1612842357a(23) =5667628973a(24) =20019876401a(25) =71078302590a(26) =253504107762a(27) =908014000543
External references
- oeis: A216630