# A017420 (b-file synthesized from sequence entry) 0 256 1 815730721 2 110075314176 3 2251875390625 4 20047612231936 5 111429157112001 6 457163239653376 7 1517108809906561 8 4304672100000000 9 10828567056280801 10 24759631762948096 11 52389094428262881