Number of colorings of K_4 using at most n colors.

Terms

a(0) =1a(1) =11a(2) =66a(3) =276a(4) =900a(5) =2451a(6) =5831a(7) =12496a(8) =24651a(9) =45475a(10) =79376a(11) =132276a(12) =211926a(13) =328251a(14) =493725a(15) =723776a(16) =1037221a(17) =1456731a(18) =2009326a(19) =2726900a(20) =3646776a(21) =4812291a(22) =6273411a(23) =8087376a(24) =10319375a(25) =13043251a(26) =16342236a(27) =20309716a(28) =25050026a(29) =30679275