Number of nondecreasing arrays of n 1..n integers with the sum of their 4th powers equal to sum(i^4,i=1..n).
A216642
Number of nondecreasing arrays of n 1..n integers with the sum of their 4th powers equal to sum(i^4,i=1..n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =2a(8) =5a(9) =11a(10) =25a(11) =51a(12) =136a(13) =367a(14) =886a(15) =2507a(16) =6986a(17) =20453a(18) =60708a(19) =172073a(20) =524771a(21) =1628140a(22) =5085497
External references
- oeis: A216642