# A354863 (b-file synthesized from sequence entry) 1 1 2 5 3 19 4 121 5 601 6 5641 7 35281 8 406561 9 3447361 10 45420481 11 439084801 12 7565564161 13 80951270401 14 1525654690561 15 20737536019201 16 421943967244801 17 6046686277632001 18 150482493928166401 19 2311256907767808001 20 61410502863943833601 21 1132546296081328128001