# A020962 (b-file synthesized from sequence entry) 1 1 2 3 3 8 4 22 5 55 6 137 7 334 8 812 9 1965 10 4751 11 11476 12 27714 13 66915 14 161557 15 390042 16 941656 17 2273369 18 5488411 19 13250208 20 31988846 21 77227919 22 186444705 23 450117350 24 1086679428 25 2623476229 26 6333631911 27 15290740076