# A017660 (b-file synthesized from sequence entry) 0 214358881 1 78310985281 2 2251875390625 3 23811286661761 4 146830437604321 5 645753531245761 6 2252292232139041 7 6634204312890625 8 17181861798319201 9 40213853471634241 10 86730203469006241 11 174859124550883201