# A138858 (b-file synthesized from sequence entry) 1 1 2 4 3 9 4 16 5 36 6 81 7 144 8 324 9 625 10 1156 11 2401 12 4900 13 9801 14 19600 15 39204 16 78400 17 156816 18 313600 19 627264 20 1254400 21 2509056 22 5022081 23 10042561 24 20088324 25 40182921 26 80371225 27 160731684 28 321484900 29 642977449 30 1285939600