# A121135 (b-file synthesized from sequence entry) 3 1 4 2 5 8 6 22 7 74 8 208 9 598 10 1600 11 4248 12 10880 13 27512 14 68096 15 166528 16 401408 17 957728 18 2260992 19 5292672 20 12288000 21 28329344 22 64880640 23 147721216 24 334495744 25 753670656 26 1690304512 27 3774887936 28 8396996608 29 18610157568 30 41104179200