A047107 T(n,n+2), array T as in A047100.
1, 3, 10, 36, 130, 476, 1769, 6630, 25017, 94961, 362181, 1386826, 5328341, 20531796, 79315343, 307077270, 1191203283, 4628896233, 18015359847, 70212552034, 273990076816, 1070416998344, 4186254302972, 16387566482916
Offset: 0