# A344250 (b-file synthesized from sequence entry) 1 1 2 6 3 36 4 237 5 1296 6 7992 7 46656 8 281288 9 1680282 10 10085472 11 60466176 12 362852244 13 2176782336 14 13060973952 15 78364210752 16 470186692290 17 2821109907456 18 16926669806364 19 101559956668416 20 609359800783824 21 3656158441742592 22 21936951003174912 23 131621703842267136