Convolution of the odd-indexed triangular numbers (A000384(n+1)) and the squares (A000290).

Terms

a(0) =0a(1) =1a(2) =10a(3) =48a(4) =158a(5) =413a(6) =924a(7) =1848a(8) =3396a(9) =5841a(10) =9526a(11) =14872a(12) =22386a(13) =32669a(14) =46424a(15) =64464a(16) =87720a(17) =117249a(18) =154242a(19) =200032a(20) =256102a(21) =324093a(22) =405812a(23) =503240a(24) =618540a(25) =754065a(26) =912366a(27) =1096200a(28) =1308538a(29) =1552573