# A148462 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 18 5 61 6 223 7 835 8 3296 9 13280 10 54828 11 230937 12 986261 13 4275360 14 18729877 15 82912159 16 370207793 17 1665674199 18 7546473001 19 34395212088 20 157636435318 21 725993948563 22 3358579055113 23 15600331684473 24 72730708595232 25 340230220394416 26 1596525730756138 27 7513179574478844 28 35450185529339379