# A036683 (b-file synthesized from sequence entry) 0 5 1 20 2 71 3 207 4 556 5 1390 6 3310 7 7576 8 16807 9 36331 10 76850 11 159575 12 326092 13 657124 14 1307992 15 2575180 16 5020570 17 9702043 18 18599391 19 35397328 20 66918850 21 125738650 22 234930380 23 436660010 24 807690455 25 1487269940 26 2727149885 27 4981046893