# A120897 (b-file synthesized from sequence entry) 0 1 1 3 2 10 3 33 4 106 5 336 6 1056 7 3296 8 10234 9 31648 10 97551 11 299888 12 919865 13 2816291 14 8608712 15 26278538 16 80120533 17 244022331 18 742525242 19 2257527861 20 6858558246 21 20822959508 22 63181453350 23 191601205342 24 580749971840 25 1759465640586