4-dimensional analog of centered polygonal numbers.

Terms

a(0) =0a(1) =0a(2) =1a(3) =7a(4) =26a(5) =70a(6) =155a(7) =301a(8) =532a(9) =876a(10) =1365a(11) =2035a(12) =2926a(13) =4082a(14) =5551a(15) =7385a(16) =9640a(17) =12376a(18) =15657a(19) =19551a(20) =24130a(21) =29470a(22) =35651a(23) =42757a(24) =50876a(25) =60100a(26) =70525a(27) =82251a(28) =95382a(29) =110026