Number of 4-element subsets that can be chosen from {1,2,...,4*n} having element sum 8*n+2.

Terms

a(0) =0a(1) =1a(2) =8a(3) =33a(4) =86a(5) =177a(6) =318a(7) =519a(8) =790a(9) =1143a(10) =1588a(11) =2135a(12) =2796a(13) =3581a(14) =4500a(15) =5565a(16) =6786a(17) =8173a(18) =9738a(19) =11491a(20) =13442a(21) =15603a(22) =17984a(23) =20595a(24) =23448a(25) =26553a(26) =29920a(27) =33561a(28) =37486a(29) =41705