Number of 1X5 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 1 zero-sum 5-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).

A192692

Number of 1X5 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 1 zero-sum 5-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).

Terms

    a(0) =2a(1) =8a(2) =21a(3) =48a(4) =93a(5) =170a(6) =285a(7) =452a(8) =674a(9) =985a(10) =1379a(11) =1894a(12) =2524a(13) =3307a(14) =4272a(15) =5414a(16) =6790a(17) =8406a(18) =10290a(19) =12475a(20) =14998a(21) =17857a(22) =21159a(23) =24847a(24) =29047a(25) =33708a(26) =38944a(27) =44737a(28) =51180a(29) =58301

External references